Homo Deus: A Brief History of Tomorrow

For almost all of history, humanity fought three fixed enemies: famine, plague, and war. Harari shows that, for the first time, these three threats are no longer guaranteed destiny. Today, in the world as a whole, more people die from eating too much than from too little, and more people die of old age and suicide than from violence between countries.

According to the author, when a species solves its oldest problems, it doesn't stop dreaming, it changes the agenda. The next frontier becomes conquering death, securing permanent happiness, and expanding the abilities of body and mind to a level once attributed only to divinity.

It's like a family that, after paying off its debts and securing rent, food, and health insurance, starts dreaming of an international trip, cosmetic surgery, or early retirement. Once the basics are handled, ambition automatically moves up a level.

A word of caution here: this is a trend observed in the species as a whole over decades, not an individual promise. Any real decision about health, longevity, or treatment should go through a professional, never through expectations built from a popular science book.

Anthropocene is the name scientists have started using to describe an era in which the main force shaping the planet is no longer volcanoes, meteors, or solar cycles but human activity itself, from the climate to the shape of rivers and forests.

One number tends to shock people who hear it for the first time: the combined weight of the animals humanity has domesticated, like cattle and chickens, already far exceeds the weight of the wild animals left roaming free, because the human species now decides, in practice, what grows and what disappears.

For Harari, this unprecedented power did not come alone: it also brought a new responsibility, because a wrong decision about resources or energy today doesn't affect just one isolated region, it affects the entire planet at once.

The human species did not win by being stronger or faster than other animals. It won because it figured out how to cooperate in large numbers with strangers, something no other primate can do on a large scale, since they are generally limited to their own family group.

Think about buying a product online from a seller who lives on the other side of the country, someone you've never seen and never will. The payment goes out, the product arrives, and it all works because there is a shared system of trust among thousands of strangers at the same time.

Harari argues that this capacity for mass cooperation doesn't come from greater individual intelligence. It comes from the ability to create and believe together in stories that no one can touch with their hands.