Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Balsa wood is classified as a hard wood!
41
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Scientists are now able to grow 'beating' heart tissue in a lab!
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German chemists made a replica of a trophy the size of one molecule.
68
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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