1) The word "orange" contains three vowels: O, A, and E.

2) Serena Williams is an American professional tennis player widely regarded as one of the greatest athletes in the sport. She has won numerous Grand Slam titles and Olympic gold medals and has become an influential figure both on and off the tennis court.

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

4) The total length of your blood vessels can circle the Earth more than twice.