MIT Technology Review, November 8, 2010

After an endocrinologist in Walnut Creek, California, diagnosed a middle-aged male patient with hypertension, she put him on a regimen of Diovan, a medication that lowers blood pressure, and sent him home with supplies: a waterproof stick-on patch and a bottle of microchips.

The patch adhered like a Band-Aid to the patient's abdomen and measured body temperature and other vital signs. The microchips, which were stuck to the outside of otherwise ordinary-looking pills, sent a signal to the patch when stomach fluids activated them, indicating that they'd been swallowed.

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