1) The process of nuclear fusion powers the sun and other stars, fusing hydrogen atoms together to form helium and releasing vast amounts of energy in the process.

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

3) The world's oldest tree is believed to be a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

4) The world's largest desert is the Antarctic Desert, covering around 5.5 million square miles.