1) The Mariana Trench in the western Pacific Ocean is the deepest part of the world's oceans, reaching a depth of approximately 36,070 feet (10,994 meters).

2) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.

3) The world's first credit card was introduced in 1950 by Diners Club.

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