NASA rover Curiosity is beavering away up on Mars, examining rocks, drilling holes, checking out the weather -- but it's not just up there to look at the planet's hospitability for humans. It's also looking for conditions favourable for life; not now, but in the past, when Mars may have been home to extraterrestrial microbes. But maybe the answer is right here on Earth, after all -- in the form of a meteorite.
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