Blame it on Aristotle. So far humanity has been coasting along the Greek philosopher’s five senses model to navigate the world. But when scientists that eternally curious breed are not all Professor Calculus, who is all knees and elbows, bumping into things and stubbing his toes. They are smart people who have now found that to avoid such disasters, you need to develop a hitherto undiscovered sense named proprioception. The British Psychological Society (BPS) Research Digest has added three more major senses—proprioception, interoception, and vestibular senses that take the total to eight, not to mention other body sensors.