[Source: Medical X-Press

Have you ever received an unexpected kindness? A stranger in the car ahead of you paid your highway toll. Or a kind consumer picked up your tab at Starbucks. These actions can set off a chain reaction of kindness, as you pay that kindness forward to the next unsuspecting person in line.

But when does this pay-it-forward mentality first emerge in humans? New research at the University of Virginia found that the phenomenon is first seen in four-year-olds.

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