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Try the GYROSCOPE, this is a neat gadget, it cost 10$-20$ in any science shop, planetarium. Also, you may try rocks, all kinds of rocks, ferrite, etc. These do not cost much.
Try the GYROSCOPE, this is a neat gadget, it cost 10$-20$ in any science shop, planetarium. Also, you may try rocks, all kinds of rocks, ferrite, etc. These do not cost much.