The diamagnetism snack requires that you use neodymium magnets, which are
about 40 times stronger than classic ferrite magnets.
You need a piece of neodymium at least 1 inch long by 1/2 inch by 1/2 inch.
The bigger the better.
Paul "But it is more complicated than that!" Doherty,
Senior Staff Scientist, The Exploratorium.
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