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A 2002 photo of then-NIST biomedical engineer Laurie Locascio placing a water sample on a highly sensitive, inexpensive "lab-on-a-chip" that provides warning within seconds of even trace amounts of toxic chemicals in water.

A 2002 photo of then-NIST biomedical engineer Laurie Locascio placing a water sample on a highly sensitive, inexpensive "lab-on-a-chip" that provides warning within seconds of even trace amounts of toxic chemicals in water.

A 2002 photo of then-NIST biomedical engineer Laurie Locascio placing a water sample on a highly sensitive, inexpensive "lab-on-a-chip" that provides warning within seconds of even trace amounts of toxic chemicals in water.

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