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Ferrofluid

Entertain yourself for hours with the CZ Ferrofluid Magnetic Display ($30 from ThinkGeek). Wow your labmates as you move the spiky colloidal liquid around with a magnet. Warning: This is a toy for grownups only.

Entertain yourself for hours with the CZ Ferrofluid Magnetic Display ($30 from ThinkGeek). Wow your labmates as you move the spiky colloidal liquid around with a magnet. Warning: This is a toy for grownups only.