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In 1960, Dr Frank Drake came up with the Drake Equation - a formula calculating the likelihood of of extraterrestrial intelligence from seven key elements. The figures, approximate as they were, suggested the number of alien civilisations able to communicate with Earth was at least 10,000. But with the recent discovery of microbes which thrive in an arsenic-rich environment, scientists are now contending with the idea that life on Earth...

2010-12-15

 Drake Equation Frank Drake extraterrestrial life arsenic evolution life prehistoric civilization microbe biochemistry