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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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When we look for life beyond Earth, we usually search for its chemical signatures.

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The recent discovery of methane emissions on Mars, for example, is a possible sign of bacterial life.

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But there is another way to detect life.

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See if it moves.

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"Everything moves.

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I'm looking for something that I know that should be alive and does not move, but up to now I have not seen anything like this."

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Giovanni Longo, a physicist at the ¨¦cole Polytechnique F¨¦d¨¦rale in Lausanne, Switzerland.

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"It's extremely interesting, because it gives us a possible new definition of life if you want.

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If it moves, then it's alive."

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Longo and his colleagues studied the movements of bacteria, yeast, mouse, human and plant cells, using the nanosensor in an atomic force microscope.

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And they found that every living cell they studied vibrated in tune with the metabolic processes going on inside.

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When they altered bits of the cells' metabolism, the vibrations changed;

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when they killed the cells in the sample chamber--the vibrations stopped.

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The findings appear in the Proceedings of the National Academy of Sciences.

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Using their nanosensor search technique, the researchers were able to detect the vibrations of life in soil and water samples, too.

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So why not do the same thing on Mars?

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An atomic force microscope has in fact already been sent there, on the Phoenix Lander, though it wasn't set up to do these types of analyses.

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"But it can be done, so next time they can just modify it a little bit."

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And in doing so - expand our suite of life-detecting tools.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Christopher Intagliata.

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