For every gallon of sea water, you get more than a quarter pound of salt.
45
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
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
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Your brain is 80% water.
525
A single speck of dust is half way in size between a subatomic particle and the Earth.
15