Balsa wood is classified as a hard wood!
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Pure water (H2O) does not conduct electricity on its own.
46
A cubic yard of air weighs about 2 pounds at sea level.
31
One 75-watt bulb gives more light than three 25-watt bulbs.
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