RationalityA user's guide to rationality during an epidemic of unreason In the twenty first century, humanity is reaching new heights of scientific understanding and at the same time appears to be losing its mind. How can a species that discovered vaccines for Covid 19 in less than a year produce so much fake news, quack cures and conspiracy theorizing? In Rationality, Pinker rejects the cynical cliche that humans are simply an irrational species. After all, we