Out of all the senses, smell is most closely linked to memory.
146
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
Sound travels fifteen times faster through steel than through air.
134
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
A ball of glass will bounce higher than a ball made of rubber.
73
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The left ear is more responsive to words of love and emotion whispered into it than the right.
40