in an effort to feel less bleh after being asleep all day I am googling more barnacle facts. did you know they expand their shells over time! we're not totally sure how they do it since once they're adults they don't molt like other crustaceans. but the current theory is that they add layers to the outside of their shells and then sort of. dissolve the inside.
also because the barnacle glue is so strong (far outlasts the life of the barnacle and withstands sea water and constant physical and temperature stress) they're trying to figure out how to recreate it for dental and industrial applications.
and they all have penises AND ovaries. thanks barnacles 🙏