Summary Of 21 Lessons for the 21st Century While author Yuval Noah Harari focused on the past and the future in his previously bestselling books, his latest release, 21 Lessons for the 21st Century, addresses the urgent issues the world currently faced with, and the radical changes that await us in the immediate future. Harari focuses the first half of his book covering large swaths of political and technological advances and issues that have arisen...