“I think it's tragic that we have this human capacity, which appears to be hardwired, or so the evolutionary biologists say, for collective joy. We have these techniques for generating it that go back thousands of years, and yet we tend not to use this.”

“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.”