This is an extremely easy science magic trick that you can perform using pepper, water, and detergent. The trick illustrates the effect of detergent on the surface tension of water. ... more.

This Video teaches you the steps to making an electric pen. ... more.

Expand the description and view the text of the steps for this how-to video. Check out Howcast for other do-it-yourself videos from ninjagoldfish and more videos in the Science & Technology Projects category. You can contribute too! Create your own DIY guide at http://www.howcast.com/videos/new or produce your own Howcast spots with the Howcast Filmmakers Program at http://www.howcast.com/fi... more.

This gun shoots mini-marshmallows with pin-point accuracy. Build an arsenal of them and have war games at your next family gathering or poker night... Video Tutorial ... more.