Iron weighs more after it rusts.
16
One barrel of petroleum holds 42 gallons.
20
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
The sun is 330,330 times larger than the earth.
75
In zero gravity, a candle's flame is round and blue.
16
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89