[In our Three-Minute Tech series, we tell you everything you really need to know about a technology in three minutes or less.]

Kicking back on the couch to watch a game, enjoy a movie, or lose yourself in the latest episode of Game of Thrones is a great way to relax. However, shopping for an HDTV can be baffling. LED or plasma? 120Hz or 240Hz? HDTV specs are as numerous as they are confusing, but here’s what a few of the most-common terms mean.

For more info, check out PCWorld’s HDTV buying guide.

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[In our Three-Minute Tech series, we tell you everything you really need to know about a technology in three minutes or less.]

When you’re in a noisy environment—on an airplane, bus, or train, say—and you want to listen to music, you have three choices. You can turn up the volume so the headphones audio drowns out the background noise, you can use headphones that block some of that noise, or you can use noise-canceling headphones, which allow you to maintain a safe level of volume, while getting rid of much of the ambient sound. Obvious, the latter two options are much better for your hearing.

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