> Diodes occur naturally, all you need to do is find them! Even true for LEDs! https://en.wikipedia.org/wiki/Silicon_carbide#Natural_occurrence https://en.wik

> Diodes occur naturally, all you need to do is find them! Even true for LEDs! https://en.wikipedia.org/wiki/Silicon_carbide#Natural_occurrence https://en.wikipedia.org/wiki/Silicon_carbide#Natural_occurr... https://en.wikipedia.org/wiki/Light-emitting_diode#History https://en.wikipedia.org/wiki/Light-emitting_diode#History