Why can’t you just inject serotonin to feel happy?
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Serotonin is named after “serous tone” which means it makes (digestive) organs contract (and as it happens, make some blood vessels swell).
There’s a type of tumor called a carcinoid that can do just that.
Imagine chemicals can be part of a dialect that are the language of how organs and cells work.
Imagine the brain is a separate place with separate rules and especially grammar from the rest of the body that needs to work hard in different ways in its own languages and dialects with a least seven languages each with a couple local dialects and has strong guards to make sure that any chemical that would try to do what it could elsewhere generally couldn’t, since the brain only needs other places to do things, like get oxygen from the lungs that the heart got there, and sugar/ATP from digestion. It wouldn’t make sense to grow chocolate in Switzerland and make candy bars in warm places it would melt anyway! Same idea.
To get to the brain by injection, it’d cause a lot of problems with the rest of the body.
Your task is to think up some ways around that.
Quick edits to refine.
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