The earth is approx. 6,588,000,000,000,000,000 tons.
175
Hot water can freeze faster than cold water.
181
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One 75-watt bulb gives more light than three 25-watt bulbs.
57