Ragnar Benson is one of the most famous preppers ever. And while certain details from Benson's numerous books are dated today (we never had a nuclear war with the Soviets), much of his advice still stands the test of time. Namely, Ragnar Benson's "Rule Of Threes." What is this "Rule Of Threes?" It's the idea that you need a back-up plan for your back-up plan . If you're planning your emergency food supply, stockpiling canned goods is fine. But what will you do once your canned goods run out? Or if you can't reach your cache? Maybe you'll try foraging? But is that your only option? What about hunting? Or fishing? Do you have those skills as well? Thinking in threes gives you more alternative routes to achieving your survival goals. For instance, you'll often see people brush aside essential skills and items - like clean water or medicine. "I'll just use my water purification tabs, or find a river..." "I already have a f...