Ancient Egyptians slept on pillows made of stone! See more

Pigs can't sweat because they don't have sweat glands. See more

Every single "all a's" domain name, from a.com to aaa..aaa.com (63 a's) has been registered! See more

There are 206 bones in your skeleton. See more

The Nile catfish swim upside down. See more

Lightning strikes about 6,000 times per minute on this planet. See more

It takes about 20 seconds for a red blood cell to circle the whole body. See more

Like fingerprints, everyone's tongue print is different. See more

The cigarette lighter was invented before the match. See more