1) Cyclones are fueled by warm ocean waters and atmospheric conditions that allow the formation of thunderstorms.

2) The Great Wall of China is not visible from space without aid, contrary to popular belief.

3) The first graphical web browser, Mosaic, was released in 1993 and played a key role in popularizing the World Wide Web.

4) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.