1) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.

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

3) The world's first car radio was invented in 1929.

4) The Battle of Waterloo in 1815 marked the final defeat of Napoleon Bonaparte and the end of his reign as Emperor of France.