Octopuses also have a brain in each tentacle! (I didn't learn this today but maybe this can be someone else's TIL)1. Starfish have eyes on the ends of their arms.
Futurama had an episode about that. Roseanne Barr cameoed as a virtual dictionary guide telling users definitions and parts of speech they were. The ending of the episode had her continuing the joke which was hilarious because the user looked up Futurama and her response was, “Definition: Gee I don’t know! You just watched it! Here’s a new word. Idiot. Part of Speech: Noun. Definition: You!”Not a learned today thing, but a long time ago people use to collect whale vomit (looks like a stone) from the sea and use it to make perfume.