These are the modern lights and not the old tungsten-based lights which brighten a wire made from a spiral of a spiral of maybe a third spiral yet (are there three?) that can only be made of tungsten. There isn't lead in pencils anymore either. We use graphite these days. Honestly I never use pencils. I wander, I know. dictionary.com's definition for a diode is: a device, as a two-element electron tube or a semiconductor (substance, as silicon or germanium, with electrical conductivity intermediate between that of an insulator and a conductor), through which current can pass freely in only one direction
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