Levitation and Diamagnetism

Thanks to one of my students, for sending me this link of levitating mice in a magnetic field. It's actually really similar to a bunch of work on levitating a frog in a magnetic field. Of course frogs and mice are not magnetic, but do become so if you apply a strong enough magnetic field (several Teslas) via an effect called Diamagnetism.

When the field is turned off (gently) the frog/mouse is no longer magnetic and returns to the ground. There are apparently no adverse or lasting side effects–you experience similar fields in an MRI machine.