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It's a story of astonishing human feat. The Kenyan runner, Kelvin Kiptum, broke the men's marathon world record in Chicago on Sunday, winning in two hours and 35 seconds to beat compatriot Eliud Kipchoge's previous mark by more than 30 seconds.

And he was only 35 seconds short of running a marathon under two hours - which looks like a target that might soon be broken.

Ed Caesar is the author of 'Two Hours: The Quest to Run the Impossible Marathon' – Newshour’s Nuala McGovern asked him he made of the achievement?

(picture: Kelvin Kiptum; credit - USA Today Sports)