Alternative Power

4 "Junior Solar Sprint":

For younger students (not even in high school yet), there's a "miniature" version of the Solar Car Challenge.  It's called the "Junior Solar Sprint":
http://www.usaeop.com/programs/competitions/jss/

The Junior Solar Sprint is a free educational program for students in grades 5-8.  Students design, build and race solar powered cars .. but these are small enough to hold in your hand.  Each has its own solar panel on top that directly powers a small DC motor.  The solar cars are available as complete kits.