Christmas-card study confirms friendship limits

12/24/2013 | New Republic (free registration), The

The number of Christmas cards that the average family receives hovers around 150, providing empirical evidence to support the notion that the human brain isn't capable of supporting more than about 150 meaningful social relationships, researchers say. The study suggests "that the cognitive constraints on network size may apply universally to all modern humans," the researchers wrote.

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New Republic (free registration), The

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