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In a series of experiments, Ryota Kanai, a researcher at UCL Institute of Cognitive Neuroscience, had college students between the ages of 19 and 28 state their Facebook network size, then scanned their brains by MRI.

Cooperation confounds us: Humans are the only members of the animal kingdom to display this tendency to the extent that we do, and it’s an expensive endeavor with no guarantee of reciprocal rewards. While we continue to look for answers about how and why cooperation may have emerged in human social and cultural evolution, we are beginning to trace the developmental roots of prosocial behaviors. A recent PLoS paper presents evidence that children as young as 15 months old may have a rudimentary sense of fairness

Urban life can be trying--cars and buses honk, passersby jostle, concrete and brick win out over grass and trees. Researchers have known for decades that residents of densely populated areas have higher rates of mental illnesses, including anxiety disorders and schizophrenia

One of the few exceptions to the old saying “everybody is afraid of something” is a 44-year-old woman known to psychologists as patient SM.