Sharks have an incredible ability to resist disease; in fact, they get sick less often than any other fish. This is probably why they have been around longer than crocodiles, humans or even dinosaurs. Because the shark is much more primitive than the human, researchers are trying to figure out more about the shark’s immune system. Someday they may even use that knowledge to help regulate the immune systems of human cancer patients.
Bonus Fact: Sharks first appeared in the seas 200 million years before the dinosaurs.