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

2) The national animal of Australia is the kangaroo.

3) The shortest war in history lasted only 38 to 45 minutes between Britain and Zanzibar in 1896.

4) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.