For thousands of years humans have relied on the fight-or-flight response to perceived harm to keep us safe. Today however, that response has trouble distinguishing between actual threats and a sudden noise in a scary movie. The bigger risks we face, like driving to work or picking the bag of chips over the piece of fruit, don’t trigger this response. Today we worry about what we think is going to harm us, even if it’s statistically irrational; it’s plane flights, severe weather, or our cell phone battery dying that triggers our fight-or-flight response. So too, in investing, we worry about market crashes, the US bankruptcy, or not being part of “the next Google” that everyone should have seen coming. In reality, we should be more concerned about the little things we have control over that are more likely to “kill us” in the long-run than scare us in the short-term. Barry Ritholtz looks into our understanding of risks in What Kills You and Your Investments.