Derrick Pitts, chief astronomer and planetarium director for the Franklin Institute in Philadelphia, talks to the "CBS This Morning" co-hosts about the 10,000-year-old woolly mammoth carcass found in ... more 
Derrick Pitts, chief astronomer and planetarium director for the Franklin Institute in Philadelphia, talks to the "CBS This Morning" co-hosts about the 10,000-year-old woolly mammoth carcass found in Russia that appears to have blood in it and is raising the speculation of cloning. less 
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Fri, May 31, 2013 2:50 PM EDT