The fight-or-flight response developed by our pre-human ancestors may have helped them escape from angry mastodons, but it isn't constructive in an online encyclopedia. Fossil Wiki collaboration occurs between geographically isolated people in cyberspace. Nonetheless, sometimes editors get angry and feel a natural urge to fire off an immediate retort ("fight"). The urge is accompanied by a rapid heart rate, dilated pupils, and other physiological changes associated with the body's release of adrenaline (epinephrine). Or, they get scared or peeved or wary and just log off ("flight").