Journey to the Microcosmos has nearly a million subscribers, so I’d guess lot of you already know them, but I wanted to share this video regardless.

I love all their videos (I’m also a microscopist so maybe that’s my own bias, but I think they do a great job), but this is one of my favorites since I’ve long been interested in biomineralizing microbes.

The little guys in this video grow tiny magnetic crystals inside themselves! I’ve seen some people propose using them as a source of magnetic nanoparticles, which would have potential uses in (for example) some kinds of cancer therapies.