All the best science has a “don’t try this at home” warning. This video shows what happens when you make a physics cocktail out of the liquid from a glowstick, ferrofluid and a magnet.
Ferrofluid is a liquid that becomes strongly magnetized when introduced to a magnetic field. Usually, the liquid is magnetized by having absolutely tiny 10-nanometer particles of magnetic metals, such as magnetite. As you’ll see in the video, add some glowstick juice and a magnet to this and you’ll get some pretty incredible results. All the ins and outs of this reaction are explained by the ever-informative Dianna Cowern, aka Physics Girl,