21 lezioni per il XXI secolo

21 Lessons for the 21st Century is a book written by bestseller 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. Having dealt with the distant past in Sapiens: A Brief History of Humankind (2011) and with the distant future in Homo Deus: A Brief History of Tomorrow (2016), Harari turns in 21 Lessons his attention to the present. In a loose collection of essays, many based on articles previously published, he attempts to untangle the technological, political, social, and existential quandaries that humankind faces. The book consists of five parts, each containing four or five essays.