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® a great mess-free travel activity
using their body weight to steer
and slide down the tracks
What instruments are they playing
Color anything you want onto any non-porous surface and it washes away easily
Radiometer carma-games-llc ® a great mess-free travelSet our radiometer (also known as a light mill) in the sun, or bright light, and watch the vanes spin! More light, more spin! How does it work? The vanes, or wings, in the Radiometer are alternately dark and light in color and set on a spindle in a near vacuum. When the light strikes these wings, it transfers heat to each one but not to the same degree. The lighter wing reflects the rays, and the dark wing absorbs the rays. This difference causes the
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