7). Evolution in the social brain. Science, 317, 1344-1347. 15. Pappano, L. (2001). The Connection Gap: Why Americans Feel So Alone. Piscataway, NJ: Rutgers University Press. 16. McPherson, M., Smith-Lovin, L., & Brashears, M. T. (2006). Social isolation in America: Changes in core discussion networks over two decades. A