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Resistance is NOT Futile

Make your own resistors with paper and pencil

Have you ever needed a low-value resistor for a low-voltage battery-powered circuit? Say, something in the range of 10-100 ohms? Finding this value of resistor can be difficult, if not impossible. In cases like this, you might be better off making your own resistor.

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Eat your heart out, Aibo

Why buy a robot that follows a colored ball when you can spend hundreds of hours building your own?

Dept.: You Built What?
Cost: $200
Time: Many long nights
Practical | | | | | Popcorn


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December 2009: Best of What's New

In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.

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