Crookes Radiometer
The gift: Crookes Radiometer
Why it’s great: This is made of glass, so more appropriate for older kids. Radiometers measure flux in electromagnetic radiation; the vanes within the radiometer rotate when exposed to light. The more intense the light is, the faster the vanes rotate. Great for a student who’s starting to get a little more homework and wants something more interesting than a paperweight on their desk. Seriously, I got one of these in 8th grade and still love to watch it while I work.
Price: $27
Where to buy:
