At Mile 20 of the Boston Marathon is the last and most famous of the course's four hills in Newton: Heartbreak Hill. Though it's just a modest 88-foot incline over a quarter-mile, Heartbreak Hill can sap the strength of even the strongest runner. But in the running of this year's race, the hill seemed to help mend memories of last year's.
WBUR's Bruce Gellerman was at the scene.
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