It’s a fascinating (and sometimes chilling) read. Here are a few big ideas he tackles that usually get people talking:

He raises the scary possibility that AI might make millions of people economically and militarily "useless," creating a massive social divide.

He argues that for the first time in history, more people die from eating too much than from eating too little, and more people die from old age than from infectious diseases.

This is probably the wildest part. He discusses a future where "Dataism" becomes the new religion—where we trust algorithms (like Google or Spotify) to know our feelings and make our choices better than we can ourselves.

Since we’ve mostly "conquered" famine, plague, and war, Harari suggests our new goals will be immortality, happiness, and divinity (turning ourselves into "gods" through bioengineering and AI).

It definitely makes you look at your smartphone and your doctor a little differently!