Metric, a truly natural system

At the time of writing NASA scientists are eagerly awaiting the results of soil sampling from their latest Martian probe Phoenix. Crucial to that experiment is confirmation of the presence of water. That precious substance essential to all life both here on Earth and maybe elsewhere. It also plays a big part in shaping the world geologically and meteorologically both here and possibly on Mars. What more natural a substance to choose for defining a unit of mass as was the case originally with the metric system.

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