At room temperature, the average air molecule travels at the speed of a rifle bullet.
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During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
In zero gravity, a candle's flame is round and blue.
16
Pumice is the only rock that floats on water.
14
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
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Neanderthal man had a brain capacity 100cc larger than modern man's.
50