Balsa wood is classified as a hard wood!
41
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Cold water weighs more than hot water.
93
Sound travels fifteen times faster through steel than through air.
134
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Each day, up to 150 species of life become extinct.
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For every gallon of sea water, you get more than a quarter pound of salt.
45