Ferrofluid Magnetic Display Kit

http://gadgetking.us/amz/B00MJXIEUY What is a Ferrofluid?  It is a colloidal liquid made from particles less than 10 nanometers in diameter.  When this ferrofluid is put under a magnetic field the nanoparticles jump to attention and form cool spikes.  Not exactly a kids toy, but fun nonetheless. Check it out here for…