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Ferrofluid Magnetic Liquid Toy – Science Stress Relief Gift Sailor For tips on how artWatch Science Come Alive in the Palm of Your Hand Meet the Ferrofluid Magnetic Liquid Display a hypnotic, endlessly fascinating science toy that turns the invisible force of magnetism into a stunning visual experience. Simply wave the included magnet near the sealed bottle and watch the mysterious black fluid spike, swirl, and sculpt itself into otherworldly shapes right before your eyes. Equal parts science experiment and stress relief gadget, it's