According to new theory, supernova activity millions of years ago may have mutated life-forms into human beings.
'Earth lost its protection against ultraviolet solar rays and for several hundred years the planet would have been battered by intense radiation. All sorts of mutational damage to animals' DNA would have occurred. New species could have emerged as a result. It is possible Homo sapiens may have been one of these.'
http://www.observer.co.uk/international/story/0,6903,651828,00.html
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