Plants that are not cared for will cry for help, a thirsty plant will make a high-pitched sound that is too high for us to hear. See more

Male lions can sleep for up to 20 hours a day. See more

A cat has 32 muscles in each ear. See more

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

The electric chair was invented by a dentist. See more

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

McDonalds calls frequent buyers of their food heavy users. See more

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

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