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STANFORD, Calif. (KGO) -- If you ever come face-to-face with the wrong kind of shark, there's something you probably want to avoid. Just a hint: they're long and really sharp. But now, researchers at ...

Teeth are just one factor that put some shark species at the top of the ocean food chain. They can be razor sharp, and number in the hundreds in one shark’s mouth alone. They fall out and grow back at ...