Reading is an unnatural activity in the human being, because our brain is not accustomed to keeping its attention fixed on a point for a long time: it soon tends to be confused by any new stimulus. If not, take the test: the next time you ride the bus, count how long you keep your eyes on one place; no more than 10 seconds According to clinical psychologist Vaughan Bell at University College London, "the ability to focus on a single task without interruption represents an anomaly in the history of our psychological development."

However every time we start reading, the left hemisphere of our brain starts up, working at full speed to activate different areas. According to the neurologist Stanislas Dehaene of the Collège de France "the reading ability modifies the brain". Apparently, there is more gray matter in the head of a "lion" and more neurons in the brains that read.