by Courtney Baird
The 24-year-old recently joined the Mammoth Track Club.
by Duncan Larkin, Published Apr. 2, 2012, Updated Apr. 2, 2012 at 11:30 AM UTC
Chuck Engle has won over half the marathons he's finished.
by Duncan Larkin, Published Jun. 28, 2011
Some scientists don't think so.
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