Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Scientists aren't sure what color dinosaurs were.
312
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
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
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Each day, up to 150 species of life become extinct.
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