MYTH

Of over 500 shark species, only about 10 are considered dangerous to humans. Most sharks are harmless.

Source: Shark Species and Human Risk - NOAA Fisheries

FACT

Sharks first appeared around 400 million years ago, while dinosaurs appeared around 230 million years ago.

Source: Ancient Sharks - Natural History Museum

FACT

Sharks can lose and regrow thousands of teeth in their lifetime, with some species growing new teeth every two weeks.

Source: Shark Teeth Facts - American Museum of Natural History

FACT

Sharks evolved around 400 million years ago, while trees appeared about 350 million years ago.

Source: Shark Evolution Timeline - Smithsonian Ocean

MYTH

Sharks don't sleep in the traditional sense, but they do have periods of rest and reduced activity.

Source: Do Sharks Sleep? - Discovery Channel