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How the UPC Code Works

electronics.howstuffworks.com/gadgets/high-tech-gadgets/upc.htm

Nearly every item that you purchase from a grocery store, department store, or mass merchandiser has a UPC code on it somewhere. Ever wondered why? Let's find out how the average UPC code works!

Inside a TV Remote Control

electronics.howstuffworks.com/inside-rc.htm

A fascinating look inside a TV's remote control (including the printed circuit board)!

What Is a Quartz Watch?

electronics.howstuffworks.com/gadgets/clocks-watches/quartz-watch.htm

Quartz watches actually use quartz crystals to keep time. How can they be so accurate? Find out why quartz makes such a great time keeper.

When Were CDs Invented, and How Do They Work?

electronics.howstuffworks.com/cd.htm

The advent of compact discs brought about digital storage and made pinpointing data a split-second task. But when were CDs invented, and how exactly do they work? Read on to get some answers!

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