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International Playthings Marble Runs

If you're looking for toys that double as a science experiment, choose marble runs. These fun games teach children about gravity, speed, momentum, and inertia. There are many design-your-own sets with durable plastic spirals, drops, wheels, and tubes, allowing kids to create their own twists and turns through which a marble will roll.
International Playthings
$39.99 at Sears

Enjoy building and playing with this 90 piece Marble Run set. Includes 2 funnels and a sturdy base for hours of spinning fun. Suit...able for ages 5 years old and up. WARNING: CHOKING HAZARD -- Small parts. Not for children under 3 yrs. Read More

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