Harari examines how the fusion of and biotech —specifically Big Data and Artificial Intelligence—could lead to mass unemployment and "digital dictatorships".

The book is organized into containing 21 succinct lessons: 1. The Technological Challenge

Many people feel "irrelevant" as algorithms begin to replace human judgment in the workforce.

21 lecciones para el siglo XXI by Yuval Noah Harari is a guide to navigating the present. While his previous works, Sapiens and Homo Deus , explored the past and distant future, this book focuses on the immediate technological, political, and existential challenges of today.

He argues that regulating who owns data is the most critical political question of our time. 2. The Political Challenge 21 Lessons for the 21st Century - Yuval Noah Harari