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Humans have not yet broken the 30mph barrier, but that does not appear to be far off. When Jesse Owens broke the world record in the 1930s, he hit a top speed of 21.7mph, whereas Bolt's world record has him at close to 28mph. So, fifty years from now, could we be seeing a seven-foot version of Usain Bolt, his DNA tweaked with that of a cheetah, running at speeds of over 40mph?
Beyond Usain Bolt: can the world's fast men get faster still? | The Guardian