A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If as some evidence suggests exotic micro-organisms have arisen independently of terrestrial life studying them could revolutionise biology medicine and biotechnology.

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I'm still shy - I'm no good at my children's parent-teacher conferences and I'm slowly learning how to ask for what I want. But I now know that I have a reserve of courage to draw upon when I really need it. There's nothing that I'm too scared to have a go at.