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Harry Smith takes a look back at the past 30 years of AIDS - from its earliest reports as a "gay cancer," to the Ryan White controversy, to the introduction of the term, "safe sex" into everyday life - and how the search for a cure continues.

Getting two fluids to mix in small or confined spaces is a big problem in many industries where, for instance, the introduction of one fluid can help extract another — like water pumped underground can release oil trapped in porous rock — or where the mixing of liquids is the essential point of the process. A key example of the latter is microfluidics technology, which allows for the controlled manipulation of fluids in miniscule channels often only a few hundred nanometers wide.