Tech Will Save Us Light Racer Kit ($29.99) I think the best way to get kids interested in tech is to have them create things that "work", that do something cool. Tech Will Save Us specializes in these kind of projects in kit form. Using app-based programming and instructions, this one lets you build a light that is charged wirelessly when the wheel of the bike turns. Note, these are side-facing lights, not head or tail lights. The tech is cool, the instructions clear, and the parts fit together well, though I'd suggest lending a hand when it comes time to afix the parts to the spokes of the bike so nothing gets inadvertently damaged.