Question: When did the sport played by Duff Gibson become an Olympic sport?

full_context: Document 1: Figure skating at the Olympic Games: Figure skating was first contested in the Olympic Games at the 1908 Summer Olympics. Since 1924, the sport has been a part of the Winter Olympic Games.
Document 2: Bruce Sandford: Bruce Sandford (born 18 July 1962) is a New Zealand skeleton racer who has competed in the late 1980s and early 1990s. He won a gold medal in the men's skeleton event at the 1992 FIBT World Championships in Calgary.
Document 3: Gene Kiniski: Eugene Nicholas Kiniski (November 23, 1928 – April 14, 2010) was a Canadian athlete who played football for the Edmonton Eskimos and later was a successful professional wrestler recognized as a multiple-time world heavyweight champion. "Canada's Greatest Athlete", as he billed himself for promotional purposes, was born in Edmonton, Alberta. Like Bronko Nagurski before him, Kiniski was one of the first world champions in professional wrestling to have a previous background in football. He is the father of professional wrestler Kelly Kiniski and international amateur and professional wrestler Nick Kiniski.
Document 4: Short track speed skating at the Winter Olympics: Short track speed skating has been a contest at the Winter Olympics since the 1992 Winter Games in Albertville, France. Prior to that, it was a demonstration sport at the 1988 games. The results from the 1988 demonstration competition is not included in the official Olympic statistics. The sport has been dominated by teams from Asia and North America, namely South Korea (IOC code KOR), China (CHN), Canada (CAN) and the United States (USA). Those four countries have won 134 of 168 medals awarded since 1992. South Korea leads the medal tally (and gold medal tally), with 42 medals including 21 golds since 1992. The majority of medals that South Korea won at the Winter Olympics came from short - track speed skating. Similarly, most of the China's Winter Olympics medals are from the sport.
Document 5: List of Olympic medalists in snowboarding: Snowboarding is a sport that has been contested at the Winter Olympic Games since the 1998 Winter Olympics in Nagano, Japan. Snowboarding was one of five new sports or disciplines added to the Winter Olympic programme between 1990 and 2002, and was the only one not to have been a previous medal or demonstration event. In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half - pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other. Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding. Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana. However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association. For the 2002 Winter Olympics, the giant slalom was dropped in favour of the parallel giant slalom, an event that involves head - to - head racing. In 2006, a third event, the snowboard cross, was held for the first time. In this event, competitors race against each other down a course with jumps, beams and other obstacles.
Document 6: Figure skating: Figure skating is a sport in which individuals, duos, or groups perform on figure skates on ice. It was the first winter sport included in the Olympics, in 1908. The four Olympic disciplines are men's singles, ladies' singles, pair skating, and ice dance. Non-Olympic disciplines include synchronized skating, Theater on Ice, and four skating. From novice through senior - level competition, skaters generally perform two programs (short and long) which, depending on the discipline, may include spins, jumps, moves in the field, lifts, throw jumps, death spirals, and other elements or moves.
Document 7: Chris Soule: Chris Soule (born February 5, 1973) is an American skeleton racer who competed from 1993 to 2006. He won two medals in the men's skeleton event at the FIBT World Championships with a silver in 2003 and a bronze in 1997. Soule also won the overall men's 20023 Skeleton World Cup title with multiple World Cup victories that season. He is the 3-time U.S. National Champion and remains one of the most decorated Skeleton athletes in the history of the sport.
Document 8: Duff Gibson: Duff Gibson (born August 11, 1966) is a Canadian skeleton racer who competed from 1999 to 2006. He was born in Vaughan, Ontario. His father was born on December 13, 1937. At the 2006 Winter Olympics in Turin, He won the gold medal in the men's skeleton, narrowly beating out his teammate Jeff Pain. His victory made the 39-year-old surpass ice hockey player Al MacInnis as the oldest gold medalist in Canadian Winter Olympic history. More significantly, Gibson became the oldest individual gold medalist in the history of the Winter Games, a record previously held by Norway's Magnar Solberg, who was 35 when he won the gold medal in the 20 km individual biathlon event at the 1972 Winter Olympics in Sapporo; he held the record until Ole Einar Bjørndalen won gold at the 10 km biathlon sprint aged 40 at the 2014 Sochi Olympics. He retired immediately following the 2006 Games in Turin.
Document 9: Luge: The first organized meeting of the sport took place in 1883 in Switzerland. In 1913, the Internationale Schlittensportverband or International Sled Sports Federation was founded in Dresden, Germany. This body governed the sport until 1935, when it was incorporated in the Fédération Internationale de Bobsleigh et de Tobogganing (FIBT, International Bobsleigh and Tobogganing Federation). After it had been decided that luge would replace the sport of skeleton at the Olympic Games, the first World Championships in the sport were held in 1955 in Oslo (Norway). In 1957, the Fédération Internationale de Luge de Course (FIL, International Luge Federation) was founded. Luge events were first included in the Olympic Winter Games in 1964.
Document 10: Steven Bradbury: Steven John Bradbury OAM (born 14 October 1973) is an Australian former short track speed skater and four - time Olympian. He is best known for winning the 1,000 m event at the 2002 Winter Olympics after all of his opponents were involved in a last corner pile - up. He was the first Australian to win a Winter Olympic gold medal and was also part of the short track relay team that won Australia's first Winter Olympic medal, a bronze in 1994.
Document 11: Tomass Dukurs: His younger brother Martins is also a skeleton racer. Both he and his brother made the 2010 Winter Olympics and the 2014 Winter Olympics.
Document 12: Skeleton at the Winter Olympics: Skeleton is a winter sport featured in the Winter Olympics where the competitor rides head - first and prone (lying face down) on a flat sled. It is normally run on an ice track that allows the sled to gain speed by gravity. It was first contested at the 1928 Winter Olympics in St. Moritz and again in 1948 Winter Olympics, after which it was discontinued as an Olympic sport. Skeleton was reintroduced at the 2002 Winter Olympics, with both men's and women's events, and has been held in each Winter Olympic competition since. Skeleton is so - named as the first metal sleds introduced in 1892 were said to resemble a human skeleton.
Document 13: Snowboarding at the Winter Olympics: Snowboarding is a sport at the Winter Olympic Games. It was first included in the 1998 Winter Olympics in Nagano, Japan. Snowboarding was one of five new sports or disciplines added to the Winter Olympic program between 1992 and 2002, and was the only one not to have been a previous medal or demonstration event. In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half - pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other. Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding. Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana. However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association. For the 2002 Winter Olympics, giant slalom was expanded to add head - to - head racing and was renamed parallel giant slalom. In 2006, a third event, the snowboard cross, was held for the first time. In this event, competitors race against each other down a course with jumps, beams and other obstacles. On July 11, 2011, the International Olympic Committee's Executive Board approved the addition of Ski and Snowboard Slopestyle to the Winter Olympics roster of events, effective in 2014. The decision was announced via press conference from the IOC's meeting in Durban, South Africa. A fifth event, parallel slalom, was added only for 2014. Big air was added for 2018.
Document 14: Alexander Müller (skeleton racer): Alexander Müller is an Austrian skeleton racer who competed from 1989 to 2000. He won a bronze medal in the men's skeleton event (tied with Jimmy Shea of the United States) at the 2000 FIBT World Championships in Igls.
Document 15: Alexandre Bilodeau: Alexandre Bilodeau (French pronunciation: ​ (bilɔdo); born September 8, 1987) is a retired Canadian freestyle skier from Montreal, Quebec. Bilodeau currently resides in Rosemère, Quebec. Bilodeau won a gold medal in the men's moguls at the 2010 Winter Olympics in Vancouver, becoming the first Canadian to win a gold medal at an Olympic Games held in Canada. At the 2014 Winter Olympics, he became the first Olympian in history to defend his gold medal in any freestyle skiing event as well as the first Canadian to defend an individual title since Catriona Le May Doan at the 2002 Winter Olympics. Bilodeau is a three - time FIS World Champion in dual moguls, and is also a two - time Worlds silver medalist in moguls. He was the FIS World Cup champion for the 2008 -- 09 season winning the moguls and overall freestyle skiing title that season. In his final World Cup race, he retired with a win, and in doing so, surpassed Jean - Luc Brassard for the most World Cup medals by a Canadian.
ground_truth: 1928
sub_queries: Duff Gibson >> sport Answer: skeleton
when did the skeleton become an olympic sport Answer: 1928