Geneticists are studying how sharks continually produce new teeth to explore if this genetic trait could help doctors grow human ... shark sheds a tooth, it usually falls to the seabed where it can be ...

Rendering courtesy of the National Park Service A shark no larger than a human hand that stalked the ... gets its name from the shape of its back teeth, which resemble old iron nails, and retired ...

1:48 Shark teeth said to be millions of years old up for auction Sarah Jones, a curator at Jones auction house in Saint John, said the teeth are already drawing significant bids, some exceeding ...