Our happy hour fact to amaze your drinking buddies with.

Evolution has conditioned humans to be altruistic toward those who look like they could be relatives.

Italian scientists took facial images of adult identical twins and morphed each with that of an unrelated model. They then asked the twins which of the two composites they would prefer to rescue from danger, or to marry their sister. Two-thirds of the time they picked the one with the face most similar to their own.

While this isn't exactly a revolutionary finding, in getting there researchers did uncover the precision of our instinct to favor those who look the most like us.

This is another reason why we advise charities to clone the extremely rich and send the clone army out on pledge drives.

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