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I do hope that, if microbial life is indeed found on Mars, or even our own moon, that they don't try and bring it right back to Earth...I don't really fancy being exterminated by an unrelenting bacterial infection that, being from a completely different ecosystem, is totally invulnerable to all forms of anti-biotic, and that the human immune system is incapable to fighting off.

Now, where's my oxygen tent...