Greg suggests this could make a fun activity for blind kids.

http://www.skyfell.org/soundofanimage.html

By Philip E. Ross

Could modern patterns of marriage be concentrating the genes that predispose people to autism?

http://www.youtube.com/watch?v=7Hz8gQlkiFA

• Kelvin’s Water Drop Electrostatic Generator I have always wanted to build one of these.
• Electrostatic Motor A low friction version of this would be fun to attempt.
• A simpler motor using a PVC cap
• A nice implementation

• http://www.physics.sfasu.edu/astro/courses/egr112/StirlingEngine/stirling.html
• http://www.bekkoame.ne.jp/~khirata/english/make.htm
• http://www.boydhouse.com/darryl/stirling/
• Rotary Stirling Plans