When you go to a hospital or clinic, you expect everything to be not just clean, but spotless. Therefore, you might think we use tap water in the hydraulic system of treadmills that operate in magnetic resonance imaging (MRI) facilities because tap water is clean, so any incidental spills or leaks would be of little consequence. That’s true; when it comes to environmental friendliness, it’s hard to beat plain old water. But that’s not why we use it....
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