Why do we feel like throwing up when we see someone else vomit?

There is no definite answer to this one; but here’s an evolution based theory that might explain this.

It goes back to the days when an entire tribe would hunt and eat the same thing. So if one person vomited, then you would want to vomit too because you ate the same thing.

Even though we all eat on our own now, the impulse remains to vomit when you see someone else do it.

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