1) Sloths only poop once a week, and when they do, they lose about one-third of their body weight.

2) The tongue of a blue whale is so big that about 50 people could stand on it.

3) The world's largest desert is the Sahara Desert in Africa, covering an area of about 3.6 million square miles (9.4 million square kilometers).

4) The concept of compound interest can be attributed to the ancient Babylonians, who used it in their banking practices.