Why does sharing make us happy?

So, I was gifted lots of green dumplings because if the Chinese festival and I didn’t really know what to do with them.

I don’t cook things at home, mostly I work so I eat outside.

I didn’t know what to do, so decided to give my coworkers at work. It was enough for the whole office.

They were very happy and my boring evening got happy too because if making them happy.

It’s such a small thing, how can it make us so happy?

Why does sharing make us happy?
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