These are just about the creepiest cute things (or maybe cutest creepy things) I can ever remember seeing at the APS March meeting. Even better, they are called phantom mice. Although I'm sure they'd be loads of fun to play with, and would scare the daylights out of Mathelete if they happened to turn up in her desk or fish tank unexpectedly, they're actually part of an educational system for teaching the physics of medical imaging to med school students.
brought to you by the American Physical Society