Fedor Konyukhov prepares for liftoff from the Northam Aero Club on July 12 in Northam, Australia. For the past eight days, he has had little sleep in an open gondola hurtling at high speeds through below-freezing air that is too thin to breathe. Paul Kane/Getty Images hide caption

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The insoles of Kenya's Eliud Kipchoge's running shoes are seen slipping up to his ankles, after he crosses the finish line to win the men's 42nd Berlin marathon on Sunday. He won the race, but missed the world record by 63 seconds. Hannibal Hanschke/Reuters /Landov hide caption

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Google vice president Alan Eustace is lifted by a balloon into the stratosphere, in a record-breaking skydive over New Mexico Friday. Paragon Space Development Corporation/Reuters /Landov hide caption

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British cyclist Graeme Obree, 48, celebrates setting the land speed record for prone cycling at the International Human Powered Vehicle track near Battle Mountain, Nevada. AFP/AFP/Getty Images hide caption

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