For years, the dream of "closing the loop" -- developing an algorithm that would allow a glucose-sensing device to control an insulin-delivery device -- has been an elusive dream. There have been many clues that it should be possible to figure out a program whereby either high or low blood sugar levels would be interpreted by a computer, which in turn would adjust an insulin pump's rate of delivery of insulin.
Indeed, back in the 1970's, a very expensive device called a "Biostator" was...

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