Friendship’s Dark Side: ‘We Need a Common Enemy’ Friendship generally is regarded as an unalloyed good. But scientists have found it also can be a conspiracy, a way to separate “us” from “them.” Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:‘Could Somebody Please Debunk This?’: Writing About Science When Even the Scientists Are NervousAustralia Dispatch: Preserving a Culture by Protecting the EnvironmentInterior Secretary Ryan Zinke Violated Agency Travel Policy, Report FindsA Wave of Child Abuse Accusations Against a Doctor, and Hospital Says It KnewRaye Montague, the Navy’s ‘Hidden Figure’ Ship Designer, Dies at 8347,000 Ticks on a Moose, and That’s Just Average. Blame Climate Change.