The most satisfying thing is when you make someone laugh.like a genuine laugh. The feeling is so pure. Like i made someone laugh, someone happy and like at that moment we forget all the wrong in the world.
So why don’t all vertebrates have this adaptation? It’s an advantage to animals that are active in the dark - cats, dogs, owls, raccoons, crocodiles, and so on - but it makes everything slightly blurry. Many daytime vertebrates (including humans and most other primates) do not have one and instead have better day vision.
Some people have noticed that this is a pretty efficient process and have asked if we can develop a technology based on this to improve our own desalination efforts…buuut I haven’t been able to find anyone who has actually looked into it further. If you find any info, I’d love to hear it!