The science of creating elliptically polarized light According to the researchers, twisted light can be produced using the ...

but almost an order of magnitude more efficient than plain-old incandescents. There’s a lot more to learn about light bulbs. In 1885, the U.S. had an estimated 300,000 carbon filament bulbs.

We tested the low-beam performance of single-filament (9003) and dual-filament (H7) bulbs from GE, Hella, Philips, and Sylvania, and PIAA's dual-filament bulb. We also compared their performance ...

but you can roll your own filament counter from an old mouse. [Bin Sun]’s build is based around an old ball-type PS/2 mouse, the kind with the nice optical encoders. Mice of this vintage are ...