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Set it on a cup of lukewarm coffee and watched the flywheel spin for almost 20 minutes—such a clever demonstration of heat transfer. The polished brass cylinder looks great on my desk too.

Setting it up with just a mug of hot water was so easy, and watching the flywheel actually spin is surprisingly mesmerizing. The clear base makes it simple to see exactly how the heat differential drives the piston, which is perfect for explaining the concept of thermodynamics.

Runs on just the warmth of my palm, which is honestly the coolest part — you can feel the flywheel spin up from nothing. Took a few tries to get the balance right on the base, but once it’s level, it’s mesmerizing to watch.