Hummingbirds are the only birds that can fly backwards. See more

The heart beats about 100,000 times each day. See more

Every year, you eat approximately 4 bugs in your sleep. See more

Americans, on average, eat 18 acres of pizza every single day. See more

Heroin used to be a cough medicine for children. A German company (Bayer) registered heroin as a trademark. See more

The thumbnail grows the slowest; the middle nail grows the fastest. See more

72% of people in Mali earn less than $1 per day. See more

In Switzerland, it's against the law to slam your car door. See more

A cat has 32 muscles in each ear. See more