| http://www.w3.org/ns/prov#value | - s making that comeback in the tour de france, and it showed blood levels with values with the likelihood of occurring naturally in less than 1 in a million. so a great deal of questions will be raised as lance armstrong continues to assert that he rode those last two years cleanly. there is a great deal of speculation about that. erin? >> thanks, ed. now i want to bring in our panel. david epstein
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