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Batteries from Everyday Things

No one can dispute the usefulness of electricity. But what do you do if you’re in a remote area without AC power or batteries? Make sneaky batteries, of course! And once you know how to make sneaky batteries, you’ll never again be totally out of power sources. Read more »

Mechanical Image Duplicator

Before Chester Carlson invented photocopying, inventors engineered various mechanical devices to replicate images. With a few everyday items found in the home, you can make a pantograph, an image duplicator that allows you to use one pencil to trace an image while another pencil follows its path in parallel to... Read more »

1+2+3: Hypsometer

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Using simple trigonometric principles, you can closely estimate the height of objects with an easy-to-make-hypsometer (hyps means height in Greek). Read more »