Male "ghost sharks"—eerie deep-sea fish known as chimaeras that are related to sharks and rays—have a strange rod jutting from their foreheads, studded with sharp, retractable teeth. New research appearing in Proceedings of the National Academy of Sciences reveals these are not merely lookalikes, but real rows of teeth that grow outside the mouth.
I did not read the article. I was curious why and how forehead tewth are an evolutionary advantage but I am okay with not knowing. That’s enough internet for next week