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The Discovery Center Museum in Rockford is teaching visitors how to make a sundial, an ancient tool used to tell time using the sun.

If you're planning to increase your electrical load by adding a new major appliance, make sure your panel can handle it. Here's how.

When you need a multimeter for testing electrical equipment around the home, it's vital to know what all those symbols around the dial mean.

NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.