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21 Nov 2009
A perfectly clean fire produces almost no smoke. Smoke simply means that a fire is not burning properly and that bits of unburned material are escaping.
The insecticide DDT was discovered in 1939 by the Swiss chemist Paul Muller while working for the J.R Geigy company.
Each speck of dust contains a million, million atoms.
Oxygen becomes a liquid if cooled to below minus 183 degrees centigrade (minus 297 F). The resulting liquid is pale blue. Cool it still further, to minus 218 degrees centigrade (minus 361 F), and it becomes a bright red solid.
Living organisms consist of nothing but molecules. There are some thousand million million million million (10 to the 27th power) molecules of water, a hundred thousand million million million (10 to the power 23) molecules of protein and ten thousand million million (10 to the 16th power) molecules of DNA in an adult human being.
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