97-588: The World Aquatics Swimming World Cup (formerly known as the FINA Swimming World Cup ) is an international series of swimming meets organized by World Aquatics (the international governing body formerly known as FINA). Launched in 1988, the World Aquatics Swimming World Cup is staged between August and November every year and attracts a high level of athletes due to the considerable prize money on offer. The event
194-760: A conference in anthropology held by the Wenner-Gren Foundation, at Burg Wartenstein Castle, which it then owned in Austria, attended by the same scholars that attended the Pan African Congress, including Louis Leakey and Mary Leakey , who was delivering a pilot presentation of her typological analysis of Early Stone Age tools, to be included in her 1971 contribution to Olduvai Gorge , "Excavations in Beds I and II, 1960–1963." However, although
291-450: A drag suit include the depletion of proper stroke. This is caused by the swimmer's own fatigue. When the swimmer becomes more fatigued, different muscle groups become more tired. Consequently, the swimmer will try to engage another group of muscle to do the same thing, which can cause the stroke efficiency to drop. Elite and international swimming comprises the highest level of competition available to swimmers, including competitions such as
388-476: A freestyle or medley relay . A medley relay consists of four swimmers who will each swim a different stroke, ordered as backstroke, breaststroke, butterfly and freestyle. Swimming each stroke requires a set of specific techniques; in competition, there are distinct regulations concerning the acceptable form for each individual stroke. There are also regulations on what types of swimsuits , caps, jewelry and injury tape that are allowed at competitions. Although it
485-420: A hammerstone to obtain large and small pieces with one or more sharp edges. The original stone is called a core; the resultant pieces, flakes. Typically, but not necessarily, small pieces are detached from a larger piece, in which case the larger piece may be called the core and the smaller pieces the flakes . The prevalent usage, however, is to call all the results flakes, which can be confusing. A split in half
582-572: A long course pool. There are forty officially recognized individual swimming events in the pool; however the International Olympic Committee only recognizes 32 of them. The international governing body for competitive swimming is World Aquatics , which was known until 2023 as the Fédération Internationale de Natation ("International Swimming Federation"), or FINA. In open water swimming , where
679-782: A new Lower Paleolithic tool, the hand axe, appeared. The earliest European hand axes are assigned to the Abbevillian industry , which developed in northern France in the valley of the Somme River ; a later, more refined hand-axe tradition is seen in the Acheulian industry , evidence of which has been found in Europe, Africa, the Middle East, and Asia. Some of the earliest known hand axes were found at Olduvai Gorge (Tanzania) in association with remains of H. erectus . Alongside
776-433: A point score incorporating placings and performance. The 2023 event is notable for a number of reasons including a switch to long course (50m) format as a pre-Olympics year event, the event acting as a qualifying meet for both the forthcoming World Aquatics Championships in 2024 and Olympic Games in 2024, and the introduction of an "open" category in 50m and 100m events for transgender swimmers. The "open" category however
873-447: A race. Due to waves created by the swimmers, it can be an advantage to swim closer to the center of the pool during a race. Due to this, World Aquatics regulations specify which lane each swimmer competes in based on previous times. In a ten lane pool this is as follows: Competitive swimming, from the club through to international level, tends to have an autumn and winter season competing in short course (25 metres or yards) pools and
970-420: A semifinal or final. The clerk is also responsible for enforcing rules of the swim meet if a swimmer chooses to not show up ("No show" - NS, or "Did Not Swim" - DNS) to their events. Timekeepers : Each timekeeper takes the time of the swimmers in the lane assigned to them. Unless a video backup system is used, it may be necessary to use the full complement of timekeepers even when automatic officiating equipment
1067-606: A separate Copper Age or Bronze Age. Moreover, the technologies included in those 'stages', as Goodwin called them, were not exactly the same. Since then, the original relative terms have become identified with the technologies of the Paleolithic and Mesolithic, so that they are no longer relative. Moreover, there has been a tendency to drop the comparative degree in favor of the positive: resulting in two sets of Early, Middle and Late Stone Ages of quite different content and chronologies. By voluntary agreement, archaeologists respect
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#17327945296941164-547: A single dolphin kick may be added to the breaststroke pullout before the first breaststroke kick. In the past decade, American competitive swimmers have made the most use of the underwater dolphin kick, notably Olympic and World medal winners Michael Phelps and Ryan Lochte . World Championship pools must be 50 metres (160 ft) ( long course ) long and 25 metres (82 ft) wide, with ten lanes labelled zero to nine (or one to ten in some pools; zero and nine (or one and ten) are usually left empty in semi-finals and finals);
1261-507: A spring and summer season competing in long course (50-metre) pools and in open water. In international competition and in club swimming in Europe, the short course (25m) season lasts from September to December, and the long course (50m) season from January to August with open water in the summer months. These regulations are slowly being brought to competition in North America. As of right now, in club, school, and college swimming in
1358-786: A time known as the Copper Age (or more technically the Chalcolithic or Eneolithic, both meaning 'copper–stone'). The Chalcolithic by convention is the initial period of the Bronze Age. The Bronze Age was followed by the Iron Age . The transition out of the Stone Age occurred between 6000 and 2500 BC for much of humanity living in North Africa and Eurasia . The first evidence of human metallurgy dates to between
1455-565: A wide range of techniques derived from multiple fields. The work of archaeologists in determining the paleocontext and relative sequence of the layers is supplemented by the efforts of geologic specialists in identifying layers of rock developed or deposited over geologic time; of paleontological specialists in identifying bones and animals; of palynologists in discovering and identifying pollen, spores and plant species; of physicists and chemists in laboratories determining ages of materials by carbon-14 , potassium-argon and other methods. The study of
1552-638: Is Polyester. The main difference between competition and regular swimwear is that competition swimwear is tighter and compresses the muscles of the swimmers. Regular swimwear is easier to put on and more comfortable for leisure activities. The most used practice swimwear for men includes briefs and jammers . Males generally swim barechested . There was controversy after the Beijing Olympic Games in 2008 when many Olympic swimmers broke records an unprecedented number of times using revolutionary swimsuits that covered their entire legs. To highlight
1649-435: Is an individual or team racing sport that requires the use of one's entire body to move through water. The sport takes place in pools or open water (e.g., in a sea or lake). Competitive swimming is one of the most popular Olympic sports , with varied distance events in butterfly , backstroke , breaststroke , freestyle , and individual medley . In addition to these individual events, four swimmers can take part in either
1746-535: Is associated with the remains of Neanderthal man . The earliest documented stone tools have been found in eastern Africa, manufacturers unknown, at the 3.3 million-year-old site of Lomekwi 3 in Kenya. Better known are the later tools belonging to an industry known as Oldowan , after the type site of Olduvai Gorge in Tanzania. The tools were formed by knocking pieces off a river pebble, or stones like it, with
1843-542: Is called bipolar flaking. Consequently, the method is often called "core-and-flake". More recently, the tradition has been called "small flake" since the flakes were small compared to subsequent Acheulean tools . The essence of the Oldowan is the making and often immediate use of small flakes. Another naming scheme is "Pebble Core Technology (PBC)": Pebble cores are ... artifacts that have been shaped by varying amounts of hard-hammer percussion. Various refinements in
1940-477: Is in the nature of this boundary. If there is no distinct boundary, then the population of A suddenly stopped using the customs characteristic of A and suddenly started using those of B, an unlikely scenario in the process of evolution . More realistically, a distinct border period, the A/B transition, existed, in which the customs of A were gradually dropped and those of B acquired. If transitions do not exist, then there
2037-423: Is low – the 2015 FINA World Cup series has a total prize fund of $ 3,000 per race shared between the top three and the 2014–15 USA Grand Prix Series $ 1,800 compared to the 2015 World Aquatics Championships fund of $ 60,000 per race shared between the top eight. Stone Age Paleolithic Epipalaeolithic Mesolithic Neolithic The Stone Age was a broad prehistoric period during which stone
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#17327945296942134-621: Is no proof of any continuity between A and B. The Stone Age of Europe is characteristically in deficit of known transitions. The 19th and early 20th-century innovators of the modern three-age system recognized the problem of the initial transition, the "gap" between the Paleolithic and the Neolithic. Louis Leakey provided something of an answer by proving that man evolved in Africa. The Stone Age must have begun there to be carried repeatedly to Europe by migrant populations. The different phases of
2231-571: Is now considered to be a facies of Acheulean , while Sangoan is a facies of Lupemban . Magosian is "an artificial mix of two different periods". Once seriously questioned, the intermediates did not wait for the next Pan African Congress two years hence, but were officially rejected in 1965 (again on an advisory basis) by Burg Wartenstein Conference #29, Systematic Investigation of the African Later Tertiary and Quaternary ,
2328-426: Is possible for competitive swimmers to incur several injuries from the sport, such as tendinitis in the shoulders or knees, there are also multiple health benefits. Evidence of recreational swimming in prehistoric times has been found, with the earliest evidence dating to Stone Age paintings from around 10,000 years ago. Written references date from 2000 BC, with some of the earliest references to swimming including
2425-586: Is possible to speak of a general 'Stone Age' period for the whole of humanity, some groups never developed metal- smelting technology, and so remained in the so-called 'Stone Age' until they encountered technologically developed cultures. The term was innovated to describe the archaeological cultures of Europe. It may not always be the best in relation to regions such as some parts of the Indies and Oceania, where farmers or hunter-gatherers used stone for tools until European colonisation began. Archaeologists of
2522-456: Is traditionally held in short course (25m pool) format, with a switch to long course (50m pool) format in pre-Olympics years. Prior to the COVID hiatus in 2020 the event was being held in three clusters, totaling seven three day meets across seven different locations with prize money reaching US$ 2.5 million. The event resumed in 2021 as four meets each of three days duration, and the 2023 edition
2619-417: Is used. A chief timekeeper assigns the seating positions for all timekeepers and the lanes for which they are responsible. In most competitions there will be one or more timekeepers per lane. In international competitions where full automatic timing and video placing equipment is in use timekeepers may not be required. Inspectors of turns : One inspector of turns is assigned to one or more lanes at each end of
2716-648: The 6th and 5th millennia BC in the archaeological sites of the Vinča culture , including Majdanpek , Jarmovac , Pločnik , Rudna Glava in modern-day Serbia. Ötzi the Iceman , a mummy from about 3300 BC, carried with him a copper axe and a flint knife. In some regions, such as Sub-Saharan Africa , the Stone Age was followed directly by the Iron Age. The Middle East and Southeast Asian regions progressed past Stone Age technology around 6000 BC. Europe, and
2813-608: The Fauresmith and Sangoan technologies, and the Second Intermediate Period between Middle and Later, to encompass the Magosian technology and others. The chronologic basis for the definition was entirely relative. With the arrival of scientific means of finding an absolute chronology, the two intermediates turned out to be will-of-the-wisps . They were in fact Middle and Lower Paleolithic . Fauresmith
2910-675: The Iliad , the Odyssey , the Bible , Beowulf , the Quran and others. In 1538, Nikolaus Wynmann, a Swiss–German professor of languages, wrote the earliest known complete book about swimming, Colymbetes, sive de arte natandi dialogus et festivus et iucundus lectu ( The Swimmer, or A Dialogue on the Art of Swimming and Joyful and Pleasant to Read ). Swimming emerged as a competitive recreational activity in
3007-578: The Olympic Games and the World Aquatics Championships . Swimming creates a mix of levels, including: fully professional, semi-professional, and amateur. Fully professional swimmers will typically get a salary both from their national governing body and from outside sponsors, semi-professionals a small stipend from their national governing body, and amateurs receive no funding. Outside of these major championships prize money
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3104-440: The genus Homo , and possibly by the earlier partly contemporaneous genera Australopithecus and Paranthropus . Bone tools have been discovered that were used during this period as well but these are rarely preserved in the archaeological record . The Stone Age is further subdivided by the types of stone tools in use. The Stone Age is the first period in the three-age system frequently used in archaeology to divide
3201-500: The geologic time scale : The succession of these phases varies enormously from one region (and culture ) to another. The Paleolithic or Palaeolithic (from Greek: παλαιός, palaios , "old"; and λίθος, lithos , "stone" lit. "old stone", coined by archaeologist John Lubbock and published in 1865) is the earliest division of the Stone Age. It covers the greatest portion of humanity's time (roughly 99% of "human technological history", where "human" and "humanity" are interpreted to mean
3298-411: The 100-yard or 100-meter IM – particularly, for younger or newer swimmers (typically under 14 years) involved in club swimming, or masters swimming (over 18). Since the 1990s, the most drastic change in swimming has been the addition of the underwater dolphin kick. This is used to maximize the speed at the start and after the turns in all styles. David Berkoff became the first to use it successfully; at
3395-672: The 1830s in England. In 1828, the first indoor swimming pool, St George's Baths was opened to the public. By 1837, the National Swimming Society was holding regular swimming competitions in six artificial swimming pools , built around London . The recreational activity grew in popularity and by 1880, when the first national governing body, the Amateur Swimming Association was formed, there were already over 300 regional clubs in operation across
3492-505: The 1988 Olympics, he swam most of the 100 m backstroke race underwater and broke the world record in the distance during the preliminaries. Another swimmer to use the technique was Denis Pankratov at the 1996 Olympics in Atlanta, where he completed almost half of the 100 m butterfly underwater to win the gold medal. The dolphin kick was rarely used in freestyle sprint races until 2008, when "technical" swimsuits were introduced to
3589-592: The Nile valley. Consequently, they proposed a new system for Africa, the Three-stage System. Clark regarded the Three-age System as valid for North Africa; in sub-Saharan Africa, the Three-stage System was best. In practice, the failure of African archaeologists either to keep this distinction in mind, or to explain which one they mean, contributes to the considerable equivocation already present in
3686-568: The Olympics was the 1922 Women's Olympiad . Butterfly was developed in the 1930s and was at first a variant of breaststroke, until it was accepted as a separate style in 1952. FINA renamed itself World Aquatics in December 2022. Competitive swimming became popular in the 19th century. The goal of high level competitive swimming is to break personal or world records while beating competitors in any given event. Swimming in competition should create
3783-521: The Stone Age ended in a given area. In Europe and North America, millstones were in use until well into the 20th century, and still are in many parts of the world. The terms "Stone Age", "Bronze Age", and "Iron Age" are not intended to suggest that advancements and time periods in prehistory are only measured by the type of tool material, rather than, for example, social organization , food sources exploited, adaptation to climate, adoption of agriculture, cooking, settlement , and religion. Like pottery ,
3880-407: The Stone Age has never been limited to stone tools and archaeology, even though they are important forms of evidence. The chief focus of study has always been on the society and the living people who belonged to it. Useful as it has been, the concept of the Stone Age has its limitations. The date range of this period is ambiguous, disputed, and variable, depending upon the region in question. While it
3977-649: The Stone Age thus could appear there without transitions. The burden on African archaeologists became all the greater, because now they must find the missing transitions in Africa. The problem is difficult and ongoing. After its adoption by the First Pan African Congress in 1947, the Three-Stage Chronology was amended by the Third Congress in 1955 to include a First Intermediate Period between Early and Middle, to encompass
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4074-466: The Stone Age. In Sub-Saharan Africa, however, iron-working technologies were either invented independently or came across the Sahara from the north (see iron metallurgy in Africa ). The Neolithic was characterized primarily by herding societies rather than large agricultural societies, and although there was copper metallurgy in Africa as well as bronze smelting, archaeologists do not currently recognize
4171-532: The United States and Canada, the short course (25 yards) season is much longer, from September to March. The long-course season takes place in 50-meter pools and lasts from April to the end of August with open water in the summer months. In club swimming in Australasia , the short course (25m) season lasts from April to September, and the long course (50m) season from October to March with open water in
4268-399: The back for backstroke, etc.) If an official observes a swimmer breaking a rule concerning the stroke they are swimming, the official will report what they have seen to the referee. The referee can disqualify (or DQ) any swimmer for any violation of the rules that they personally observe or for any violation reported to them by other authorized officials. All disqualifications are subject to
4365-528: The country. In 1844 two Native American participants at a swimming competition in London introduced the front crawl to a European audience. Sir John Arthur Trudgen picked up the hand-over stroke from some South American natives and successfully debuted the new stroke in 1873, winning a local competition in England. His stroke is still regarded as the most powerful to use today. Captain Matthew Webb
4462-457: The decision and discretion of the referee. Those who are disqualified may choose to contest their disqualification. In age-group level swimming, however, this is rare. Appeals are reviewed by a panel of officials instead of the deck referee or stroke judges who may have made the initial disqualification decision. Brands such as Arena , Speedo , TYR , and Adidas are popular regular swimwear brands. The most durable material for regular swimming
4559-540: The decisions of the Pan-African Congress on Prehistory , which meets every four years to resolve the archaeological business brought before it. Delegates are actually international; the organization takes its name from the topic. Louis Leakey hosted the first one in Nairobi in 1947. It adopted Goodwin and Lowe's 3-stage system at that time, the stages to be called Early, Middle and Later. The problem of
4656-496: The discovery of these "Lomekwian" tools, the oldest known stone tools had been found at several sites at Gona, Ethiopia , on sediments of the paleo- Awash River , which serve to date them. All the tools come from the Busidama Formation, which lies above a disconformity , or missing layer, which would have been from 2.9 to 2.7 mya . The oldest sites discovered to contain tools are dated to 2.6–2.55 mya. One of
4753-548: The early Stone Age, when species prior to Homo may have manufactured tools. According to the age and location of the current evidence, the cradle of the genus is the East African Rift System, especially toward the north in Ethiopia , where it is bordered by grasslands . The closest relative among the other living primates , the genus Pan , represents a branch that continued on in the deep forest, where
4850-587: The events are swum in a body of open water (lake or sea), there are also 5 km, 10 km and 25 km events for men and women. However, only the 10 km event is included in the Olympic schedule, again for both men and women. Pool and open-water competitions are typically separate events, except at the World Championships and the Olympics. In competitive swimming, four major styles have been established. These have been relatively stable over
4947-440: The final answer to all questions relating to the actual conduct of anything regarding the meet, as well as the final settlement of which is not otherwise covered by the rules. The referee takes overall responsibility for running the meet and makes the final decisions as to who wins each race. Referees call swimmers to the blocks with short blasts of their whistles. This is the signal for the swimmers to stand next to their blocks. Then
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#17327945296945044-400: The first to transition away from hunter-gatherer societies into the settled lifestyle of inhabiting towns and villages as agriculture became widespread . In the chronology of prehistory, the Neolithic era usually overlaps with the Chalcolithic ("Copper") era preceding the Bronze Age. The Stone Age is contemporaneous with the evolution of the genus Homo , with the possible exception of
5141-731: The genus Homo ), extending from 2.5 or 2.6 million years ago, with the first documented use of stone tools by hominins such as Homo habilis , to the end of the Pleistocene around 10,000 BC. The Paleolithic era ended with the Mesolithic , or in areas with an early neolithisation , the Epipaleolithic . At sites dating from the Lower Paleolithic Period (about 2,500,000 to 200,000 years ago), simple pebble tools have been found in association with
5238-589: The grasslands of the rift, Homo erectus , the predecessor of modern humans, found an ecological niche as a tool-maker and developed a dependence on it, becoming a "tool-equipped savanna dweller". The oldest indirect evidence found of stone tool use is fossilised animal bones with tool marks; these are 3.4 million years old and were found in the Lower Awash Valley in Ethiopia. Archaeological discoveries in Kenya in 2015, identifying what may be
5335-589: The hand-axe tradition, there developed a distinct and very different stone-tool industry, based on flakes of stone: special tools were made from worked (carefully shaped) flakes of flint. In Europe, the Clactonian industry is one example of a flake tradition. The early flake industries probably contributed to the development of the Middle Paleolithic flake tools of the Mousterian industry , which
5432-504: The intermediate periods were gone, the search for the transitions continued. In 1859 Jens Jacob Worsaae first proposed a division of the Stone Age into older and younger parts based on his work with Danish kitchen middens that began in 1851. In the subsequent decades this simple distinction developed into the archaeological periods of today. The major subdivisions of the Three-age Stone Age cross two epoch boundaries on
5529-484: The issue, in 2008, 70 world records were broken in one year, and 66 Olympic records were broken in one Olympic Games (there were races in Beijing where the first five finishers were swimming faster than the old world record). As of 1 January 2010, men are only allowed to wear suits from the waist to the knees. They are also only permitted to wear one piece of swimwear; they cannot wear briefs underneath jammers. This rule
5626-645: The journal Annals of the South African Museum . By then, the dates of the Early Stone Age, or Paleolithic , and Late Stone Age, or Neolithic ( neo = new), were fairly solid and were regarded by Goodwin as absolute. He therefore proposed a relative chronology of periods with floating dates, to be called the Earlier and Later Stone Age. The Middle Stone Age would not change its name, but it would not mean Mesolithic . The duo thus reinvented
5723-655: The knees), regular length (shoulders to hips), and bikini style (two-piece). As of 1 January 2010, in competition, women must wear suits that do not go past the shoulders or knees. Drag suits are used to increase water resistance against the swimmer to help them train for competitions. Other forms of drag wear include nylons, old suits, and T-shirts: articles that increase friction in the water to build strength during training, and thus increase speed once drag items are removed for competition. Some swimmers practice in basketball shorts over their bathing suit, wearing two bathing suits, or wearing an extra bathing suit with holes cut in
5820-784: The lanes must be at least 2.5 metres (8.2 ft) wide. They will be equipped with starting blocks at both ends of the pool and most will have Automatic Officiating Equipment, including touch pads to record times and sensors to ensure the legality of relay takeovers. The pool must have a minimum depth of two metres. Other pools which host events under World Aquatics regulations are required to meet some but not all of these requirements. Many of these pools have eight, or even six, instead of ten lanes and some will be 25 metres (82 ft) long, making them Short course . World records that are set in short course pools are kept separate from those set in long course pools because it may be an advantage or disadvantage to swimmers to have more or less turns in
5917-442: The last 30 to 40 years with minor improvements. They are: In competition, only one of these styles may be used except in the case of the individual medley, or IM, which consists of all four. In this latter event, swimmers swim equal distances of butterfly, then backstroke, breaststroke, and finally, freestyle. In Olympic competition, this event is swum in two distances: 200 and 400 meters. Some short course competitions also include
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#17327945296946014-638: The late 19th and early 20th centuries CE, who adapted the three-age system to their ideas, hoped to combine cultural anthropology and archaeology in such a way that a specific contemporaneous tribe could be used to illustrate the way of life and beliefs of the people exercising a particular Stone-Age technology. As a description of people living today, the term Stone Age is controversial. The Association of Social Anthropologists discourages this use, asserting: To describe any living group as 'primitive' or 'Stone Age' inevitably implies that they are living representatives of some earlier stage of human development that
6111-400: The least resistance in order to obtain maximum speed. However, some professional swimmers who do not hold a national or world ranking are considered the best in regard to their technical skills. Typically, an athlete goes through a cycle of training in which the body is overloaded with work in the beginning and middle segments of the cycle, and then the workload is decreased in the final stage as
6208-579: The literature. There are in effect two Stone Ages, one part of the Three-age and the other constituting the Three-stage. They refer to one and the same artifacts and the same technologies, but vary by locality and time. The three-stage system was proposed in 1929 by Astley John Hilary Goodwin, a professional archaeologist, and Clarence van Riet Lowe , a civil engineer and amateur archaeologist, in an article titled "Stone Age Cultures of South Africa" in
6305-420: The majority of humankind has left behind. In the 1920s, South African archaeologists organizing the stone tool collections of that country observed that they did not fit the newly detailed Three-Age System. In the words of J. Desmond Clark : It was early realized that the threefold division of culture into Stone, Bronze and Iron Ages adopted in the nineteenth century for Europe had no validity in Africa outside
6402-465: The material. Many swimmers also shave areas of exposed skin before end-of-season competitions to reduce friction in the water. The practice gained popularity after the 1956 Olympics, when Murray Rose and Jon Henricks came shaved and won gold medals for Australia. Freshly shaven skin is less resistant when in the water. In addition, a 1989 study demonstrated that shaving improves a swimmer's overall performance by reducing drag. The disadvantages of using
6499-478: The morning and finals in the evening. A noted exception to this style are the meets held in Brazil, where prelims have been in the evening with finals the following morning. On most years, the races are held in short course pools, the exception recently being the season leading up to an Olympic year where events are swum in long course venues. Current 2023 series events (to be swum in 50m pools): An 'open' category
6596-466: The most striking circumstances about these sites is that they are from the Late Pliocene , where prior to their discovery tools were thought to have evolved only in the Pleistocene . Excavators at the locality point out that: ... the earliest stone tool makers were skilled flintknappers ... The possible reasons behind this seeming abrupt transition from the absence of stone tools to
6693-532: The oldest evidence of hominin use of tools known to date, have indicated that Kenyanthropus platyops (a 3.2 to 3.5-million-year-old Pliocene hominin fossil discovered in Lake Turkana, Kenya, in 1999) may have been the earliest tool-users known. The oldest stone tools were excavated from the site of Lomekwi 3 in West Turkana , northwestern Kenya, and date to 3.3 million years old. Prior to
6790-457: The pool. Each inspector of turns ensures that swimmers comply with the relevant rules for turning, as well as the relevant rules for start and finish of the race. Inspectors of turns shall report any violation on disqualification reports detailing the event, lane number, and the infringement delivered to the chief inspector of turns who will immediately convey the report to the referee. Judges of Stroke : Judges of stroke are located on each side of
6887-450: The pool. They follow the swimmers during their swim back and forth across the pool. They ensure that the rules related to the style of swimming designated for the event are being observed, and observe the turns and the finishes to assist the inspectors of turns. Finish judges : Finish judges determine the order of finish and make sure the swimmers finish in accordance with the rules (two hands simultaneously for breaststroke and butterfly, on
6984-626: The presence thereof include ... gaps in the geological record. The species that made the Pliocene tools remains unknown. Fragments of Australopithecus garhi , Australopithecus aethiopicus , and Homo , possibly Homo habilis , have been found in sites near the age of the Gona tools. In July 2018, scientists reported the discovery in China of the known oldest stone tools outside Africa, estimated at 2.12 million years old. Innovation in
7081-581: The primates evolved. The rift served as a conduit for movement into southern Africa and also north down the Nile into North Africa and through the continuation of the rift in the Levant to the vast grasslands of Asia. Starting from about 4 million years ago ( mya ) a single biome established itself from South Africa through the rift, North Africa, and across Asia to modern China. This has been called "transcontinental 'savannahstan ' " recently. Starting in
7178-447: The referee will blow a long whistle that will tell the swimmers to step on the block. For backstroke events, the long whistle is the signal for the swimmers to jump into the water. The referee will then blow another long whistle, signalling the swimmers to grab the gutter or the provided block handle. Finally the referee will hand over the rest to the starter by directing their hand to the starter. Starter : The starter has full control of
7275-605: The remains of what may have been the earliest human ancestors. A somewhat more sophisticated Lower Paleolithic tradition, known as the Chopper chopping tool industry, is widely distributed in the Eastern Hemisphere. This tradition is thought to have been the work of the hominin species named Homo erectus . Although no such fossil tools have yet been found, it is believed that H. erectus probably made tools of wood and bone as well as stone. About 700,000 years ago,
7372-487: The rest of Asia became post-Stone Age societies by about 4000 BC. The proto-Inca cultures of South America continued at a Stone Age level until around 2000 BC, when gold, copper, and silver made their entrance. The peoples of the Americas notably did not develop a widespread behavior of smelting bronze or iron after the Stone Age period, although the technology existed. Stone tool manufacture continued even after
7469-486: The scientific study of the lithic reduction of the raw materials and methods used to make the prehistoric artifacts that are discovered. Much of this study takes place in the laboratory in the presence of various specialists. In experimental archaeology , researchers attempt to create replica tools, to understand how they were made. Flintknappers are craftsmen who use sharp tools to reduce flintstone to flint tool . In addition to lithic analysis, field prehistorians use
7566-511: The short course season if a swimmer wanted to compete in a stroke they had just learned, a 25-yard/meter race is available to them, opposed to the long course season when they would need to be able to swim at least 50 meters of that new stroke in order to compete. There are several types of officials, which are needed to manage the competition. Referee : The referee has full control and authority over all officials. The referee will enforce all rules and decisions of World Aquatics and shall have
7663-594: The sport at the European Short Course Championships in Rijeka, Croatia. Technical-suited Amaury Leveaux set world records of 44.94 seconds in the 100 m freestyle , 20.48 seconds in the 50 m freestyle and 22.18 in the 50 m butterfly, spending more than half of each race submerged, more than any of his competitors. Subsequently, FINA made a rule that swimmers may not go farther than 15 metres underwater. In 2014, FINA rules that
7760-445: The start of a race with a loud noise (usually a beep or a horn) and flash from a strobe light. A starter sends the swimmers off the blocks and may call a false start if a swimmer leaves the block before the starter sends them. A starter may also choose to recall the race after the start for any reason or request the swimmers to "stand", "relax" or "step down" if they believe that (a) particular swimmer(s) has obtained an unfair advantage at
7857-492: The start. Clerk of course : The clerk of course (also called the "bullpen") assembles swimmers before each event, and organizes ("seeds") swimmers into heats based on their times. Heats are generally seeded from slowest to fastest, where swimmers with no previous time for an event are assumed to be the slowest. The clerk of the course is also responsible for recording and reporting swimmers who have chosen to "scratch" (not swim) their events after they have signed up or qualified to
7954-642: The summer months. Outside the United States, meters is the standard in both short and long course swimming, with the same distances swum in all events. In the American short course season, the 500-yard, 1000 yard, and 1650-yard freestyle events are swum as a yard is much shorter than a meter (100 yards equals 91.44 meters), while during the American long course season the 400 meter, 800 meter, and 1500-meter freestyle events are swum instead. Beginning each swimming season racing in short course allows for shorter distance races for novice swimmers. For example, in
8051-412: The swimmer approaches competition. The practice of reducing exercise in the days just before an important competition is called tapering . Tapering is used to give the swimmer's body some rest without stopping exercise completely. A final stage is often referred to as "shave and taper": the swimmer shaves off all exposed hair for the sake of reducing drag and having a sleeker and more hydrodynamic feel in
8148-418: The swimmers from the time the referee turns the swimmers over to them until the race commences. A starter begins the race by saying, "Take your mark." At this point, the swimmers will get into stationary positions, sometimes known as "point zero", in which they would like to start their race. After all swimmers have assumed their stationary position, the starter will push a button on the starting system, signaling
8245-461: The technique of smelting ore is regarded as the end of the Stone Age and the beginning of the Bronze Age . The first highly significant metal manufactured was bronze , an alloy of copper and tin or arsenic , each of which was smelted separately. The transition from the Stone Age to the Bronze Age was a period during which modern people could smelt copper, but did not yet manufacture bronze,
8342-533: The timeline of human technological prehistory into functional periods, with the next two being the Bronze Age and the Iron Age , respectively. The Stone Age is also commonly divided into three distinct periods: the earliest and most primitive being the Paleolithic era; a transitional period with finer tools known as the Mesolithic era; and the final stage known as the Neolithic era. Neolithic peoples were
8439-450: The transitions in archaeology is a branch of the general philosophic continuity problem, which examines how discrete objects of any sort that are contiguous in any way can be presumed to have a relationship of any sort. In archaeology, the relationship is one of causality . If Period B can be presumed to descend from Period A, there must be a boundary between A and B, the A–B boundary. The problem
8536-472: The typology of the stone tools combined with the relative sequence of the types in various regions provide a chronological framework for the evolution of humanity and society. They serve as diagnostics of date, rather than characterizing the people or the society. Lithic analysis is a major and specialised form of archaeological investigation. It involves the measurement of stone tools to determine their typology, function and technologies involved. It includes
8633-479: The water. Additionally, the "shave and taper" method refers to the removal of the top layer of "dead skin", which exposes the newer and richer skin underneath. This also helps to "shave" off mere milliseconds on your time. Swimming is an event at the Summer Olympic Games , where male and female athletes compete in 16 of the recognized events each. Olympic events are held in a 50-meter pool, called
8730-423: Was created in 2023 after World Aquatics announced that trans women were banned from competing in the women's category if they had "experienced any part of male puberty beyond tanner stage two, or before [the] age [of] 12, whichever is later". The category was shelved after receiving "no entries". Source: One stage in 1979. 89 90 92 99 00 01 02 03 04 05 06 Swimming (sport) Swimming
8827-516: Was enacted after the controversy in the Beijing Olympics and Rome World Championships. Women wear one-piece suits with thicker and higher backs for competition, though two-piece suits can also be worn during practice. Backs vary mainly in strap thickness and geometric design. Most common styles include: racerback, axel back, corset, diamondback, and butterfly-back/Fly-Back. There are also different style lengths: three-quarter length (reaches
8924-658: Was held in Scotland in 1892. Men's swimming became part of the first modern Olympic Games in 1896 in Athens . In 1902, the Australian Richmond Cavill introduced freestyle to the Western world. In 1908, the world swimming association, Fédération Internationale de Natation (FINA), was formed. Women's swimming was introduced into the Olympics in 1912; the first international swim meet for women outside
9021-607: Was known in the Stone Age, it is the melting and smelting of copper that marks the end of the Stone Age. In Western Asia , this occurred by about 3000 BC, when bronze became widespread. The term Bronze Age is used to describe the period that followed the Stone Age, as well as to describe cultures that had developed techniques and technologies for working copper alloys (bronze: originally copper and arsenic, later copper and tin) into tools, supplanting stone in many uses. Stone Age artifacts that have been discovered include tools used by modern humans, by their predecessor species in
9118-425: Was shelved as there were no entries. Traditionally the events are the same for all meets but the competition order may vary, although this has varied from the 2021 resumption of the meet. All events are swum prelims/finals, with the exception of the 800m freestyle and 1500m freestyle which are swum as timed finals (fastest heat in the finals session). The meets are held over two or three days, with preliminary heats in
9215-440: Was staged as three meets each of three days duration. The event is popular with prominent swimmers due to the prize money on offer. In 2022, a total of US$ 1.2 million was awarded. For each meet the top 20 male and female athletes shared US$ 224,000 prize money ($ 112,000 per gender). At the end of the meet series an additional US$ 262,000 per gender was awarded to the top eight men and women athletes based on their overall ranking using
9312-670: Was the first man to swim the English Channel (between England and France), in 1875. Using the breaststroke technique, he swam the channel 21.26 miles (34.21 km) in 21 hours and 45 minutes. His feat was not replicated or surpassed for the next 36 years, until T.W. Burgess made the crossing in 1911. Other European countries also established swimming federations; Germany in 1882, France in 1890 and Hungary in 1896. The first European amateur swimming competitions were in 1889 in Vienna . The world's first women's swimming championship
9409-404: Was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years and ended between 4000 BC and 2000 BC, with the advent of metalworking . It therefore represents nearly 99.3% of human history. Though some simple metalworking of malleable metals, particularly the use of gold and copper for purposes of ornamentation,
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