Cubelets look like they’re the perfect toy for kids that are old enough to be interested in robotics and electronics but not old enough to understand an H bridge:

The cubelets standard kit comes with 20 magnetic blocks that can be snapped together to make an endless variety of robots with no programming and no wires. You can build robots that drive around on a tabletop, respond to light, sound, and temperature, and have surprisingly lifelike behavior. But instead of programming that behavior, you snap the cubelets together and watch the behavior emerge like with a flock of birds or a swarm of bees.

Modular Robotics is currently out of stock on their test batch, but they expect to have more units available later this month. [via Core77]