On SDPB this afternoon, on The World (6-7pm MT), I heard a segment about Meb Keflezighi, a 37-year-old Eritrean immgrant, who came to the USA in the '80s.
He mentions that he didn't realize that people ran for sport until he got here. "In Eritrea, we run when the soldiers come, things like that." He will represent the USA in the Olympic marathon in London, one of the final day's events.
Meb Keflezighi Eyes Gold at London 2012