_How do you fill a pipette and measure out a half c.c. of hydrochloric acid into a test tube--from a quarter million miles away?_ The real problem, of course, is not quite that simple. You don't literally fill a pipette or use a test tube; you activate metering circuits that force tiny, ground-glass plungers a measured distance into reagent pumps. You send signals that close some valves and open others, and apply heat and adjust temperatures, and filter solutions, and send the product to a spectrometer that determines what you've got and how much.…
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