Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Most dust particles in your house come from dead skin.
48
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Scientists in Germany have developed a candy that doesn't cause cavities.
11
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17