The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
If the chemical sodium is dropped into water it will immediately and violently explode.
67
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
The average temperature at 40,000 feet above sea level is -60 F.
56
Aluminum used to be more valuable than gold!
84