21 Lessons for the 21st Century

21 Lessons for the 21st Century is a book written by Israeli author Yuval Noah Harari and published in August 2018 by Spiegel & Grau in the US and by Jonathan Cape in the UK. It is dedicated to the author's husband, Itzik. The book consists of five parts, each containing four or five essays. The book focuses on present-day issues and societal questions.