The mechanisms for a waving wind-up toy is adjusted to fit the shape of a turtle. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by ...

The retro-friction toy car is an incredible piece of engineering! It's sometimes called a “wind-up” toy car. This video covers the specifics of the mechanism: the motor frame, the 5 gears and the ...