Homo Deus Book Summary

In the 21st century, humankind is likely to make a serious attempt to gain happiness, immortality, and god-like powers.

We are now at a point where we need to set a new agenda for ourselves. Having reduced mortality from starvation, disease, and violence, our next targets are likely to be extending life span, prolonging youth, and enhancing our cognitive and physical abilities. Science and technology will play a crucial role in achieving these goals.

This journey towards divinity may actually end up making us less humane. The more god-like we aspire to be, the less we may value mortal concerns. Life and death, happiness and suffering, may all become trivial matters for upgraded humans. There could emerge a new superhuman elite, far removed from the concerns and values of today.

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For thousands of years, epidemics were the most important cause of human mortality. The Black Death, which began in the 1330s, killed between 75 million and 200 million people - more than a quarter of the population of Eurasia. In England, 4 out of 10 people died. In the city of Florence, it was 1 out of 2.

However, in the last few decades, we have managed to rein in this threat. Though infectious diseases still kill millions every year, they are no longer the leading cause of death globally. This is a result of improved hygiene, better nutrition, new medicines, and most importantly - a scientific understanding of diseases. As our scientific knowledge grows, we can expect to reduce the impact of infectious diseases even further.

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Another major threat that humans have faced throughout history is violence. However, in recent decades, war and violence have been on the decline. Despite conflicts in places like Syria and Iraq, we are living in the most peaceful era in human history. More people die today from suicide or car accidents than from war and violent crime combined.

Several factors have contributed to this decline:

• The development of nuclear weapons has made war between superpowers unthinkable
• Global trade has made war less profitable
• The rise of democracy and international organizations has provided alternatives to violence
• Changing norms and values have made violence less acceptable

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Homo sapiens - our species - has had an extraordinary impact on the world. Starting from humble origins in East Africa, we have spread to every continent, reshaped ecosystems, and domesticated other species.

This journey began around 70,000 years ago with the Cognitive Revolution. It saw the emergence of new ways of thinking and communicating, including the ability to create and believe in imagined realities. This allowed large numbers of strangers to cooperate effectively.

The next major milestone was the Agricultural Revolution, which began around 12,000 years ago. By domesticating plants and animals, we were able to greatly increase the amount of food available. This allowed human populations to grow exponentially and laid the foundation for the rise of cities, kingdoms, and empires.

Finally, the Scientific Revolution, which began just 500 years ago, gave us unprecedented power to understand and manipulate the world around us. Combined with the Industrial Revolution, it has transformed almost every aspect of human life.

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One of the most important developments in human history has been the gradual rise of humanism. This is the belief that humans are the ultimate source of meaning and authority in the universe. Humanism took off during the Renaissance and the Enlightenment in Europe. Thinkers like Pico della Mirandola and Immanuel Kant argued for the dignity and autonomy of the individual.

Over time, humanism has manifested in different forms:

• Liberal humanism emphasizes individual freedom and sees humans as unique individuals
• Socialist humanism emphasizes equality and sees humans as shaped by their socio-economic conditions
• Evolutionary humanism emphasizes the power of natural selection and sees humans as just another species

Despite their differences, all forms of humanism share a common belief in the centrality of the human experience. They all see human feelings, desires, and choices as the ultimate arbiter of meaning and value. It underlies our political and economic systems, our approach to ethics and education, and even our understanding of history.

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