![Exquisitely-preserved mammoth tusk found 10,000 feet underwater](https://cdn.mos.cms.futurecdn.net/xmsBoBYLNJETj2iUWYata4-1200-80.jpg)
The tusk, which belonged to a female mammoth, is more than 100,000 years old Researchers have discovered a Columbian mammoth's (Mammuthus columbi) …
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