What's Dave McEvoy's starting point for Aerie Backcountry Medicine's wilderness first responder training courses? The assumption that, in the backcountry, “no one is coming to help you.” What's the corollary? That an ounce of prevention is worth a pound of cure. “First of all, what you mostly want is to not need help. So wilderness medicine classes are a lot about prevention.” Very basic prevention, it turns out, of blisters, hypothermia and twisted ankles - not to mention the potential hazards