In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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Cold water weighs more than hot water.
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One third of the electricity produced on earth is used to power electric light bulbs!
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Indoor pollution is 10 times more toxic than outdoor pollution.
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Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
A cesium atom in an atomic clock beats over nine billion times a second.
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