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
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The earth is approx. 6,588,000,000,000,000,000 tons.
175