In zero gravity, a candle's flame is round and blue.
16
Balsa wood is classified as a hard wood!
41
A cubic yard of air weighs about 2 pounds at sea level.
31
Indoor pollution is 10 times more toxic than outdoor pollution.
62
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
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Pumice is the only rock that floats on water.
14