Science toys you can make with your kids
Author: Whole Earth

The coolest source of educational science demonstrations I've encountered is this very book-like website written and run by Simon Field. Field has thirty nifty toys and gadgets that can be made quickly, cheaply and will amaze adults as well as kids. This is the only place I've seen that tells you how to make a magnetic linear accelerator, also known as a Gauss Rifle--it uses magnetism to shoot tiny steel balls. The secret to Field's method is that his demos are very small, requiring small amounts of material, energy, or money. Most of his experiments can be assembled--even if you buy the stuff--for a few dollars, and can fit in your palm. His instructions and visuals are simply the best I've seen in any how-to-book. Most wonderful of all, it's entirely up on the web for free. Hats off to you, Mr. Field. (He does sell kits, and parts, which may help pay for his server, I guess.)--KK

Building the Film Can Cannon

This toy was an instant favorite from the moment its first loud Bang! and flash of orange flame launched the little black film can up to bounce off our 26 foot ceiling It has several names: the Piezo-Popper, the Binaca Bomb, the Photo-Flash--you will probably come up with more.

The toy is very easy to make, going together in about 15 minutes, at a cost of two or three dollars if all the parts are purchased new, or free if you don't throw away certain common household items.