7 Unbelievable Shark Facts You Simply Must Believe
Because sharks deserve more than a week.
![7 Unbelievable Shark Facts You Simply Must Believe](https://s3.crackedcdn.com/phpimages/pictofact/8/7/3/741873_320x180.jpg?v=3)
Sharks have been around for more than 420 million years. Respect your terrifying elders by learning about them for more than just one week a year.
Here are seven weird shark facts that will make you go, "Huh, I really hate that I know that."
![THE AMERICAN POCKET SHARK IS 5.5 INCHES AND GLOWS IN THE DARK. Discovered in 2010, it's only one of two pocket-sized shark species.](https://s3.crackedcdn.com/phpimages/pictofact/8/6/8/741868.jpg?v=2)
![SHARKS CAN HAVE VIRGIN BIRTHS. Even though it's rare, there have been multiple recorded cases of female sharks giving birth to live young without ma](https://s3.crackedcdn.com/phpimages/pictofact/8/6/6/741866.jpg?v=2)
![THE OLDEST KNOWN SHARK IS BETWEEN 272 AND 512 YEARS OLD. Greenland sharks are the oldest living vertebrate. They don't reach sexual maturity until aro](https://s3.crackedcdn.com/phpimages/pictofact/8/6/5/741865.jpg?v=2)
![SHARKS DON'T GET CAVITIES. At least two species have a tooth coating made of 100% flouride, a main ingredient of toothpaste. CRACKED.COM](https://s3.crackedcdn.com/phpimages/pictofact/8/6/1/741861.jpg?v=2)
![WHALE SHARKS HAVE TINY TEETH ON THEIR EYEBALLS. The denticles provide protection to their vulnerable eyes. Whale sharks can also retract their eyeball](https://s3.crackedcdn.com/phpimages/pictofact/8/6/3/741863.jpg?v=2)
![MALE GHOSTSHARKS HAVE RETRACTABLE SEX ORGANS ON THEIR FOREHEADS. The appendage of the Eastern Pacific black ghostshark resembles a spiked club. Resear](https://s3.crackedcdn.com/phpimages/pictofact/8/6/2/741862.jpg?v=2)
![BABY SAND TIGER SHARKS EAT THEIR SIBLINGS IN THE WOMB. What starts as a two dozen embryos results in two dominant baby sharks. After that, the babies](https://s3.crackedcdn.com/phpimages/pictofact/8/6/4/741864.jpg?v=2)