How do we define life – or, in fact, can it be defined? Exciting new discoveries such as those recently reported in the journal Science by the ‘Tara’ group concerning the amount and distribution of marine micro-organisms are continuing to test our ideas of the biosphere

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So far, we cannot be sure that this question has been properly answered. Even so, NASA has proposed that life be taken as a self-sustained chemical system capable of undergoing Darwinian evolution. If we have a mind for science, we might then ask – is this consistent with basic principles? The life chemistry we…

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