The Professional Rock Tumbler is fun science in theory — the noise and mess make it a project for patient families only

Let me save you some frustration — the National Geographic Professional Rock Tumbler Kit is fun science in theory, but the noise and mess make it a project for patient families only. It runs for weeks at a stretch, the barrel needs periodic checking, and the grit gets everywhere if you’re not careful. That said, if your kid is genuinely fascinated by geology and you have a garage or basement where the noise won’t drive everyone crazy, the results are genuinely impressive. It’s not an impulse buy — it’s a commitment.