Out of all the senses, smell is most closely linked to memory.
146
Sound travels about 4 times faster in water than in air.
408
The storage capacity of human brain exceeds 4 Terrabytes.
140
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Most dust particles in your house come from dead skin.
48
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
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
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15