Sub-2-hour marathon barrier broken

This weekend, Kenyan distance runner Eliud Kipchoge will set out on a tree-lined course in Vienna for his second attempt to break the fabled 2-hour marathon barrier.  To do so, he’ll have to shave 26 seconds off his previous bid at an Italian auto racing track, dipping his per-mile pace below an unfathomable 4 minutes, 35 seconds per mile.