It's also very expensive. With an MSRP of $3,000, it's practically a dollar a lumen. For that price, it does have a few ...

Unlock the full potential of your smartphone flashlight with this easy DIY projector tutorial! Watch as we turn ordinary materials—just cardboard and a magnifying lens—into a powerful, focused light ...

Can you chip in? As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, ...