Web Site of the Week

Each week, we highlight a Web site that we think may be helpful in some way to teachers. The highlighted sites are not part of or connected with Science News for Kids, Science News, or Science Service. We are not responsible for their content.

Oct. 17, 2007

It's About Time

Clocks used to depend on things like falling grains of sand or swinging pendulums to keep track of time, and they did it only semi-reliably. Now, people wear inexpensive quartz watches that keep excellent time. What is a quartz watch? Who "invented" it? What are the "watch wars"? What makes it an electronic timepiece? Find answers to these and other questions at this site, sponsored by the Smithsonian Institution.

Go to: www.invention.smithsonian.org/centerpieces/quartz

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