On: New battery-free technology can power devices using ambient RF signals

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Are we basically trying to build cold blooded animals? Sit in the sun, absorb heat, now they can move.

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Cold blooded animals generally use less energy than warm blooded animals because they use environmental heat instead of producing their own. So in a way that's one possible method to making something more energy efficient

[HPsquared → blobbers]

Unlike plants, cold-blooded animals aren't solar powered.