I’ve noticed a lot of Internet chatter about the Mantis Shrimp lately, and I don’t know what that is about. But it could be this:

How would you design an experiment to test each of the hypotheses suggested here?

(Also, I note that I do not endorse the contents of this video. Spiffy music and a smart sounding voice tells our brains this must all be true and accurate but most YouTube videos like this in areas I now about are full of mistakes. If you are an expert on this stuff feel free to make comments or corrections below. Also, my reference to “cold fusion” is snark, in case that was not obvious.)