Geoffrey Mutai can’t quite explain how he can run 26 miles faster than any man ever has and not be the world record-holder. “Most of the people want to know why it was not recognized, because it was 42 kilometers,’’ says the 30-year-old Kenyan, whose clocking of 2 hours 3 minutes 2 seconds in last year’s Boston Marathon carved nearly a minute off Haile Gebrselassie’s global mark. “Even me, I don’t know.’’