Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Sound at the right vibration can bore holes through a solid object.
134
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Iron weighs more after it rusts.
16
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
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39