Balsa wood is classified as a hard wood!
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Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5
Sound travels about 4 times faster in water than in air.
408
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A cesium atom in an atomic clock beats over nine billion times a second.
43
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15