Pumice is the only rock that floats on water.
14
A cubic yard of air weighs about 2 pounds at sea level.
31
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
4.5 pounds of sunlight strike the Earth each day.
27
Scientists are attempting to create a synthetic brain by reverse-engineering the mammalian brain down to the molecular level. A cellular human brain is predicted possible by 2023. It hopes to shed light on consciousness.
10
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
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310