1) The study of fossils is called paleontology, and it helps us understand the history of life on Earth and the process of evolution.

2) The naming of cyclones varies depending on the region. For example, cyclones in the Atlantic and eastern Pacific Ocean are named using a predetermined list of names.

3) 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.

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