We can only keep in mind a limited number of mental states at once.
If you're looking to host the perfect dinner party or gathering, experts say it's best to invite people in multiples of four.
Professor Robin Dunbar, says this is because four is the maximum number of people who can maintain a successful conversation.
In his recent book, the Social Brain, he highlights the fact that we can only keep in mind a limited number of mental states at once.
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