Energy harvesting that are able to operate in higher temperature gradients, and that can conduct electricity well without also conducting heat (something that was until recently thought impossible ), will result in increased efficiency. Future work in thermoelectrics could be to convert wasted heat, such as in automobile engine combustion, into electricity. This type of harvesting is based on the changing capacitance of vibration-dependent capacitors. Vibrations separate the plates of a charged variable capacitor, and mechanical energy is converted into electrical energy. Electrostatic energy harvesters need a polarization source to work and to convert mechanical energy from vibrations into electricity. The polarization
Feathers: The Evolution of a Natural Miracle "as synthesis goes, it is gracious, funny, persuasive and wide ranging." Peter Forbes, in a review published by "The Guardian", stated that Hanson's "enthusiasm is infectious", particularly for a topic Forbes found "alluring". "The Economist" published a review which also described Hanson as having "infectious enthusiasm" and stated, "Mr Hanson's unpretentious style makes what is essentially an excellent scientific work into an enjoyable read for the ignorant and uninitiated." Irene Wanner, in a review published by "The Seattle Times", highlighted Hanson's analogies, calling them "apt" and helping to "simplify complex concepts". "Kirkus Reviews" described "Feathers" as a "delightful ramble through