Supermagnetic beads - a new demo?

If you’re a science teacher, you’ll probably have to teach separation techniques to at least one class at some point in the year. I’m sure you’ll have taught the arts of filtering, distillation and chromatography endless times, but here’s a separation technique I’ll bet you’ve never seen - and one that will make an excellent short demonstration in class when teaching this topic:

This wonderful little film was made by Dr Jim Caryl.