The Proteus Pill: Forget to take your pill? Not with this patch

Forget to take your pill? Not with this patch - SFGate: "Proteus' pill contains bits of copper and magnesium, which are digestible and found in food. When a patient swallows it, the metals react with stomach fluids to create a low electrical signal, much like the classic science experiment in which a wet potato hooked up to two metals can power a light bulb."