Some fossilized teeth from giant ancient megalodon sharks have unique scratches on them. These scratches, researchers believe ...

And because they’re eating different foods, they need different types of teeth.’ Serrated teeth have a jagged edge - a bit like the ... species of shark we know from looking at their fossilised teeth.

Sharks have ruled the Earth’s oceans for 400 million years and recent research on fossilized shark teeth has led to the ...

An illustration from Steno’s 1667 paper comparing teeth from a dissected shark head to a fossilized tooth. Nicholas Steno Fossil vertebrae that look like gigantic ashtrays gave scientists the fi ...

NOVA: Do sharks ... NOVA: Sharks have an endless supply of teeth? Gruber: Yes, and they are unique in this way, too. They produce teeth continuously. Their teeth are not set in sockets like ...

A closer look at what defines a shark ... But with 510 species of shark and 650 species of ray, what do they really have in common? Well, all sharks and rays share some fundamental features.

While some species like lemon sharks do indeed have pointed teeth to help catch their slippery ... in search of a tasty snack. Do all sharks look alike? Myth! Sharks come in all different shapes ...

New vacuums don’t come along all that often, but the latest offering from Shark is somewhat of a do-it-all hero for ... away the Shark DuoClean looks like a conventional upright vacuum cleaner.