Ferrofluids

A ferrofluid is a made up of nanoscale ferrous particles suspended in a carrier fluid such as an oil or even water. They behave in a similar fashion to non-Newtonian fluids in the sense that you can do some rather funky stuff with them.

Here’s an art installation!

https://www.youtube.com/watch?v=me5Zzm2TXh4

I like science!