These days, though, it’s not sabre-toothed cats or 200-kilogram wolves that our mind warns us about. Instead it’s losing our job, being rejected, getting a speeding ticket, not being able to pay the bills, embarrassing ourselves in public, upsetting our loved ones, getting cancer, or any of a million and one other common worries. As a result we spend a lot of time worrying about things that, more often than not, never happen.