Justin Metz for Insider
Is the urge to start a company caused by a brain parasite?
In Yellowstone National Park, a lone wolf usually ends up dead. Gray wolves typically live and hunt in packs, but sometimes a pack member leaves its family group. Other wolves, protecting their own pack's territory, will kill the loner. One kick from an elk or a bison can be deadly. And then there are more prosaic threats, like getting hit by a car. So why would any wolf take the risk of striking out on its...