An equation for friendship

Researchers at Cornell expand on the long-established social psychology theory of structural balance. They find that such balance is achieved through incremental shifts in relationships.If only they had been there in 1939: Plugging in numbers representing the friendliness between pairs of nations at the outset of World War II, researchers at Cornell University used a computer program to successfully predict which countries joined the Allied Powers and which lined up with the Axis. They got all of the countries right except for Denmark and Portugal.

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