1) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

2) Antarctica is the coldest, driest, and windiest continent on Earth. It is also the highest, with an average elevation of about 7,545 feet (2,300 meters).

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

4) The first modern Olympic marathon race was held at the 1896 Olympics in Athens and has since become one of the most iconic and challenging events in athletics.