At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Hot water can freeze faster than cold water.
181
Out of all the senses, smell is most closely linked to memory.
146
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
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
One ragweed plant can release as many as one billion grains of pollen!
51