The energy used to strike a typewriter key is 20 millijoules, a millijoule being one watt per second taken to 10 to the negative 3rd power; that keyboard-striking energy is a full order of magnitude larger than the energy a flea expends in hopping from one spot to another.
- Vaclav Smil in Energies: An Illustrated Guide to the Biosphere and Civilization
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