Why do you mention happiness in particular? 
Seriously, to be precise, it's not happiness, but generally feeling good. Feeling good isn't something that has to be described. But if you want to get into the biochemistry of it, I can.

Seriously, to be precise, it's not happiness, but generally feeling good. Feeling good isn't something that has to be described. But if you want to get into the biochemistry of it, I can.
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