The saying "It's a jungle out there" refers to a competitive environment in which you'd better hone your skills if you hope to survive. And you'd better do what you can to keep a roof over your head, food in your belly, a leaf on your loins, and a mate who'll help pass on your genes to the next generation of jungle Jims and Janes.
Distinguished professor and cognitive psychologist David Rosenbaum takes this metaphor of surviving in the wild and...