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A new sensor that tracks the tiniest movements of living organisms could help us find life on other planets.

For now, scientists test for chemicals to check for possible living things — as when Nasa found signs of life on Mars earlier this month. But the new technique could complement that, and provide further detail on how things live and breathe.

And because the chemical test requires us to already know the “metabolic pathways involved” — that is, how the chemicals that keep the beings alive work — the new test could pick up information from living creatures that we may never have been able to find before.

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