Science Facts
Hydrogen gas is the least dense substance in the world. Water expands by about 9% as it freezes. The surface of hot water freezes faster than cold water but the rest of the water will remain liquid longer than in a cold sample. The smallest transistor is 50-nanometres wide – roughly 1/2000 the width of a human hair. A compass does not point to the geographical North or South Pole, but to the magnetic poles. |
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