A crane operator working on a transit project in San Francisco unearthed a tooth of a woolly mammoth on Monday. Paleontologist James Allen told ABC News’ San Francisco affiliate, KGO-TV, that the tooth was believed to be between 10,000 and 11,000 years old, and that the fossil was...Read more http://feeds.abcnews.com/click.phdo?i=71a8a7930b52654f814b60cfd963ac49
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