The folks over on the Magnetic Games YouTube channel put up an absolutely amazing demonstration using magnetite sand and a couple of powerful magnets that allows you to see a magnetic field in action:
What surprised me about this video is how it looks like scientific illustrations of magnetic fields. I had always assumed it was much like so many other scientific illustrations in that it was an approximation of reality. Kind of the same way as our models of an atom don’t look anything like what an actual atom looks like as explained by the folks at SciShow:
So, yeah, I was surprised when you could clearly see the lines of the magnetic field as they pulled in the sand. And that’s my science geekery for the day.