On a previous show we discussed how, every 250,000 years or so, the north and south poles switch places. Not that the places themselves move, rather, the entire magnetic field of the earth flips around, resulting in the pole we now call north being on the southern tip of the planet, and vice versa. Why does this happen? Learn more on this Moment of Science.
It turns out that one of nature’s most foolproof navigators is none other than the Caribbean spiny lobster. Various attempts to disorient lobsters–which involve goofy things such as taking them away from their homes while they’re wearing eye coverings–never succeed.