I am an expert level hobbyist in electronics engineering, electronics design and manufacturing.
Jewelry that glows a bright florescent color, as well as in the dark.
A small scale model helical turbine that really works!
A small gearmotor that matches the dimensions of the Pololu #1594. Use with a FS-020 Exposed 3V DC Motor (http://www.newegg.com/Product/Product.aspx?Item=9SIA4SR1SP5001)