Starfish are famous for their ability to regenerate a disconcertingly large chunk of their bodies if dismembered. Now they also seem capable of expelling disconcertingly large objects through their skin. What up, starfish? Did you guys get bitten by a radioactive sea spider at some time during the last 500 million years?

As you saw in the video, to try to figure out exactly what was happening inside the starfish, the students injected magnets (laboratory magnetic stirring bars, in fact) so they could trace their movement. Bizarrely, rather than heading straight for the exit, the magnets went on an erratic sightseeing tour of the starfish body cavity.