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[Error Correction: At about 10:35 I mention gold conducts electricity better than copper or silver, which isn't true. Turns out silver conducts the best, then copper, then gold (see en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity#Resistivity_of_various_materials). Gold is often used in places where corrosion can be a problem, since it essentially doesn't corrode on any sort of human timescales. Thanks to Trenton Foyer for pointing this out to me.]
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