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

December 1972, astronaut Eugene Cernan (U.S.) became the last person to set foot on the moon. See more

An octopus can change its shape and color to blend in with its surroundings. See more

It is a criminal offence to drive around in a dirty car in Russia. See more

A jellyfish is 95 percent water. See more

A group of crows is called a murder. See more

Your skin weighs about 3.2 kg. See more

The first domain name ever registered was Symbolics.com. See more

Dolphins sleep with one eye open. See more