Semipermeable membrane plays role in drug-sniffing system

A drug -sniffing car kitted out with advanced sensors that can pick up suspicious chemicals has made the news rounds this month; it can smell drugs a quarter of a mile away, said Discovery News.

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Water quality

Water quality is the physical, chemical and biological characteristics of water. It is most frequently used by reference to a set of standards against which compliance can be assessed. The most common standards used to assess water quality relate to drinking water, safety of human contact, and for health of ecosystems.

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