if symptoms persist, see your dentist

busy elves. thank you intotheplanet :)

good use of standard parts

these guys are doing a ton of work to commercialize low cost high efficiency led lighting

"The Corpus Clock and The Chronophage"
gorgeous new clock design... video is worth watching all the way to the end

a humorous video version of the "bidirectional led" paper. "LED Comm was a project to use ordinary LEDs as both emitters and detectors."

a shift register wired to produce pseudo-random numbers... driving leds so you can see what it's doing :) it's like a stream or a waterfall

tacky? no way... this diagram has class :D

this is one of the better practical references to using common leds as photosensors.