In zero gravity, a candle's flame is round and blue.
16
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The smell of freshly cut grass is actually a plant distress call.
31
Iron weighs more after it rusts.
68
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
Cold water weighs more than hot water.
93