‘’Room for error does more than just widen the target around what you think might happen. It also helps protect you from things you’d never imagine, which can be the most troublesome events we face. The Battle of Stalingrad during World War II was the largest battle in history. With it came equally staggering stories of how people dealt with risk. One came in late 1942, when a German tank unit sat in reserve on grasslands outside the city. When tanks were desperately needed on the front lines, something happened that surprised everyone: Almost none of them worked. Out of 104 tanks in the unit, fewer than 20 were operable. Engineers quickly found the issue. Historian William Craig writes: “During the weeks of inactivity behind the front lines, field mice had nested inside the vehicles and eaten away insulation covering the electrical systems.” The Germans had the most sophisticated equipment in the world. Yet there they were, defeated by mice’’ The Psychology of Money Morgan Housel