We all take LEDs pretty much for granted, but the guys over at MAKE have done a good job with this movie that shows the history behind the little glowing things. Turns out the Light Emitting Diode was one of those devices that was more or less discovered by accident, during an experiment at Marconi labs into a Cat's-Whisker Schottky barrier diode made from a chunk of silicon carbide: so MAKE, of course, shows you how to recreate that for yourself. Check it out: it's fascinating stuff. [Makezine ]