At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Pure water (H2O) does not conduct electricity on its own.
46
One barrel of petroleum holds 42 gallons.
20
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
In zero gravity, a candle's flame is round and blue.
16
The only letter not appearing on the Periodic Table is the letter "J".
180