Can the marathon’s two-hour barrier be broken?

An unofficial attempt in May came within 30 seconds. But a certified breach might take decades.

Britain’s Prince Harry poses for a picture with winners of the Men’s race Wilson Kipsang who came second, left, Eliud Kipchoge who came first, centre, and Dennis Kimetto who came third, right, at the 35th London Marathon, Sunday, April 26, 2015 — AP Photo/Kirsty Wigglesworth

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