Computing lighting that looks real remains complex and inefficient, as the necessary consideration of all possible paths light can take remains too costly to be performed for every pixel in real-time.

Question: My kids are older now, and I installed a computer in their playroom. I have a ceiling light, but I would like to add a recessed light. What is the best type to use, and how do I install it?

When it comes to computation, the modern approach seems to involve an enormous bucket of bits, vigorous shaking, and not a lot of explanation of how it all works. If you ever wondered how Excel became ...