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

2) The fastest land animal is the cheetah, capable of reaching speeds up to 70 miles per hour (113 kilometers per hour) in short bursts.

3) The Mongol Empire, under the leadership of Genghis Khan, became the largest contiguous empire in history, spanning from Asia to Europe.

4) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.