Snot catches some of the 50 million particles inhaled with every breath. These particles are one hundredth the size of a human hair and comprise mineral dust, industrial and traffic dust, microorganisms and extraterrestrial particles. Some 40,000 tonnes of extraterrestrial dust falls to Earth each year and, if you are really lucky, your snot may contain a particle that came from the asteroid belt between Jupiter and Mars.
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Professor Ian Plimer’s latest book ‘Green Murder’ is published by Connor Court Publishing. It has no dust jacket.
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