This metal coil spring is ideal for visually demonstrating wave properties, such as frequency, wavelength, and interference both in the classroom and at home. It's also a classic novelty toy bringing joy to all ages and generations. Its famous for its propensity for 'walking' down staircases; just place one end of the coil on two different stair steps, and watch as the coil springs its way down the steps.
NEW 2016 DESIGN! This hip red tee features Pi to 1000 decimal places on an ultra soft 100% cotton shirt.
A massive mounted set of 100 rocks and minerals found in the US,
Build over 100 exciting electronic projects with this easy to use kit!
This adapter-powered butterfly uses Flexinor wires to create a realistic visual effect!
Defy gravity with this cool balancing eagle!
Shake the Pet Tornado clockwise and watch the mini tornado funnel form before your eyes!
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