From the phenomenal bestselling author of Sapiens and Homo DeusHow can we protect ourselves from nuclear war or ecological catastrophe?What do we do about the epidemic of fake news or the threat of terrorism?How should we prepare our children for the future? 21 Lessons is an exploration of what it means to be human in an age of bewilderment.'Fascinating…Harari has teed up a crucial global conversation about how to take on the problems of the 21st century' Bill Gates, New York Times