Research indicates that plants grow healthier when they are stroked.
173
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
Pumice is the only rock that floats on water.
14
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
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
Each day, up to 150 species of life become extinct.
-23
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117