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Power a super-bright LED from a low-voltage battery with a few bits of wire and a toroid core
Explore this weblog deeply for all sorts of year-round ideas, science fair included.
One explanation of the laser pointer sound experiment
Well organized list of ideas by subject (electricity, math, life sciences, etc.)
A fun project from Spark Bang Buzz, good for 4th grade. Explore the site for more inspiration
Some ideas here for 3rd graders who have studied sound
Great resource for parts and kits
Much more fun and easier than it sounds; never fails to impress
A fun explanation of an easy thing to do at home
