The idea of being attacked by a shark, as unlikely as it is, is scary. But why, if the odds are so low? Because our perception of risk is not just about the numbers. It's about emotions too. There is no better example of how risk perception is more a matter of emotion than of quantitative reasoning than this classic illustration of how our fears sometimes don't match the facts.
This week I received a friend request on Facebook by someone whose profile picture scared me. My choice to explore it further, rather than delete, block and quickly try to forget it, turned into one of the most fascinating conversations of my life, that now thousands around the world are involved in after just 48 hours.