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

2) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

3) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

4) The longest English word is "pneumonoultramicroscopicsilicovolcanoconiosis," which refers to a lung disease caused by inhaling very fine silica dust.