- Gravity is the weakest of the four fundamental forces. (Gravity, Electromagnetism, the Week Nuclear force, and the Strong Nuclear force).
- Atoms consist of 99.9% empty space.
- The outer core of the earth is as hot as the surface of the sun.
- The star Betelgeuse on Orion's belt is as large as our solar system and it's output has dimmed by about 15% in the last decade, suggesting that it's going to go supernova soon.
- The human brain can form more neural connections than there are atoms in the viable universe.
- There are no green mammals.
- The reason that time flows forwards and not backwards was discovered by people trying to make steam engines more efficient in the late 18th century.
- Wood is mainly made of carbon, the carbon comes from the air not the soil, thus trees are mainly made out of condensed air.
- The 'blue glow' you seen around nuclear reactors in film is a real life effect and is called called Cherinkov radiation. It occurs when radiation moves faster than light through a medium (i.e. water or air).