Quercetti Super Marble Run Vortex Building Toy

This affordable set allows you to build a large marble run. Called the Quercetti Super Marble Run Vortex set, it features 220 pieces including 2 double entrance funnels, 3 spirals, extra long bridges, and a sturdy base. The set is adaptable, so your marble run can be reconfigured based on your own designs.

Check out the Quercetti Super Marble Run Vortex and other fun marble run construction toys at Kazoo Toys.

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Unpowered Walkers and Hoppers

These clever devices, created by Peter Steinkamp, explore gravity-powered step-by-step locomotion.

There are eight videos on his site, showing a variety of inventive models that use this form of movement.

One of the creator's future goals is to incorporate what was learned from these working models into a passive bipedal robot.

Check out these fascinating gravity-powered walkers and hoppers.