FIRST AIRED: May 6, 2017

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>> He ran the fastest marathon ever on Saturday by more than two and a half minutes. But when it comes to the official record books, Kenyan Eliud Kipchoge's astounding achievement won't count. The reigning Olympic marathon champ, one of three elite runners who took part in what was essentially a marketing event by Nike, billed as a quest to conquer a marathon course in just two hours.
Kipchoge with his shockingly swift time, falling short by just 25 seconds. And he did it in a pair of customized Nikes, reportedly tricked out with a carbon fiber plate that some scientists think gives runners an unfair boost with its extra springy bounce. Rules about shoe design from the sport's governing body are vague.
Nike thinks the shoes are in compliance, but admitted other variables of the race weren't, which is why it didn't count. And while the experiment intrigued many given Kipchoge's record shattering time, it remains to be seen whether he or Nike will be the winner in the long run.