The modern world, in all its grandeur and complexity, runs off a shockingly primal force, one that has been flowing through human bodies long before the first motor was built. Electricity, that same force that has kept human hearts beating for as long as there have been human hearts to beat, today flows through the veins of civilization, powering the skyscrapers we work in and the phones in our pockets. Although the great producers of electricity, colossi like the Hoover Dam, may be the most viscerally impressive, human mastery of electrical currents is perhaps most impressive in the form of batteries. Some small enough to sit on the tip of a finger, batteries power many of the devices we...
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