Yawning is so contagious that it can spread to dogs and monkeys.
Try your hand at making these awesome patterns for Albert Einstein, Marie Curie, and Erwin Schrödinger (with some cats, naturally).
The first episode of The Simpsons aired 25 years ago today!
December 16, 1914: German Ships Shell Scarborough, Hartlepool, Whitby
©2016 Mental Floss, Inc. All rights reserved. Mental Floss® is a registered trademark owned by Felix Dennis. mentalfloss.com is a trademark owned by Felix Dennis.