Ferrofluid is an amazing liquid that follows the field of a magnet and becomes strongly magnetized in the presence of a magnetic field. NASA designed a magnetic fluid in 1963 for powering rockets because this fuel could be easily drawn to a pump by a magnet in weightless environments.
When ferrofluid meets a strong magnet, it creates spectacular structures. Amateur scientist and YouTube extraordinaire Braniac75 has created some awesome structures in the video below:
There are lots of cool patterns you can make from this fluid, but you should not touch it. Ferrofluid is a major skin irritant, and it quickly starts traveling. Although Brainiac75 has touched the spikes formed by exposing Ferrofluid, he doesn’t recommend anyone to do the same at home.