An astonishing new scientific discovery called neuroplasticity is overthrowing the centuries-old notion that the adult human brain is fixed and unchanging. It is, instead, able to change its own structure and function, even into old age. Psychiatrist and researcher Norman Doidge travelled around the US to meet the brilliant scientists championing neuroplasticity, and the people whose lives they've transformed. We see a woman born with half a brain that rewired itself to work as a whole; a woman labelled retarded who cured her deficits with brain exercises; blind people who learn to see; learning disorders cured; IQs raised; ageing brains rejuvenated; and lifelong character traits changed. Doidge takes us on to terrain that might seem fantastic. We learn that our thoughts can switch our genes on and off, altering our brain anatomy. We learn how people of average intelligence can, with brain exercises, improve their cognition and perception, develop muscle strength, or learn to play a musical instrument - simply by imagining doing so.