We use about 2 milliwatts of energy per gram - some 130 watts for an average person weighing 65kg, a bit more than a standard 100 watt light bulb. That may not sound like a lot, but per gram it is a factor of 10,000 more than the Sun (only a tiny fraction of which, at any one moment, is undergoing nuclear fusion). Life is not much like a candle; more of a rocket launcher.from The Vital Question by Nick Lane (2015)
Image of ATP synthase by David S. Goodsell, the Scripps Research Institute via PDSB
