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"By Casey Johnston | The standard model of particle physics dictates that the world is made up of sixteen types of particles divided into two types: fermions and bosons. The way these particles behave with each other shows that there are four possible kinds of interactions: electromagnetic, strong, weak, and gravitational."

""We wondered how individuals assess the credibility of other people in simple social interactions," said Read Montague, director of the Human Neuroimaging Laboratory and the Computational Psychiatry Unit at the Virginia Tech Carilion Research Institute, who led the study. "We found a strong correlation between the amygdala and a baseline level of distrust, which may be based on a person's beliefs about the trustworthiness of other people in general, his or her emotional state, and the situation at hand"