Sapiens and Homo Deus Read online

  Contents

  Cover

  Sapiens Cover

  Title Page

  Dedication

  Timeline of History

  Part One The Cognitive Revolution 1. An Animal of No Significance

  2. The Tree of Knowledge

  3. A Day in the Life of Adam and Eve

  4. The Flood

  Part Two The Agricultural Revolution 5. History’s Biggest Fraud

  6. Building Pyramids

  7. Memory Overload

  8. There is No Justice in History

  Part Three The Unification of Humankind 9. The Arrow of History

  10. The Scent of Money

  11. Imperial Visions

  12. The Law of Religion

  13. The Secret of Success

  Part Four The Scientific Revolution 14. The Discovery of Ignorance

  15. The Marriage of Science and Empire

  16. The Capitalist Creed

  17. The Wheels of Industry

  18. A Permanent Revolution

  19. And They Lived Happily Ever After

  20. The End of Homo Sapiens

  Afterword: The Animal that Became a God

  Notes

  Index

  Acknowledgements

  About the Author

  Credits

  Copyright

  About the Publisher

  Homo Deus Cover

  Title Page

  Dedication

  1 The New Human Agenda

  PART I Homo Sapiens Conquers the World 2 The Anthropocene

  3 The Human Spark

  PART II Homo Sapiens Gives Meaning to the World 4 The Storytellers

  5 The Odd Couple

  6 The Modern Covenant

  7 The Humanist Revolution

  PART III Homo Sapiens Loses Control 8 The Time Bomb in the Laboratory

  9 The Great Decoupling

  10 The Ocean of Consciousness

  11 The Data Religion

  Notes

  Acknowledgments

  Index

  About the Author

  Also by Yuval Noah Harari

  Credits

  Copyright

  About the Publisher

  Dedication

  In loving memory of my father,

  Shlomo Harari

  Contents

  Cover

  Title Page

  Dedication

  Timeline of History

  Part One The Cognitive Revolution

  1. An Animal of No Significance

  2. The Tree of Knowledge

  3. A Day in the Life of Adam and Eve

  4. The Flood

  Part Two The Agricultural Revolution

  5. History’s Biggest Fraud

  6. Building Pyramids

  7. Memory Overload

  8. There is No Justice in History

  Part Three The Unification of Humankind

  9. The Arrow of History

  10. The Scent of Money

  11. Imperial Visions

  12. The Law of Religion

  13. The Secret of Success

  Part Four The Scientific Revolution

  14. The Discovery of Ignorance

  15. The Marriage of Science and Empire

  16. The Capitalist Creed

  17. The Wheels of Industry

  18. A Permanent Revolution

  19. And They Lived Happily Ever After

  20. The End of Homo Sapiens

  Afterword: The Animal that Became a God

  Notes

  Index

  Acknowledgements

  About the Author

  Credits

  Copyright

  About the Publisher

  Timeline of History

  Years Before the Present

  13.5 billion

  Matter and energy appear. Beginning of physics. Atoms and molecules appear. Beginning of chemistry.

  4.5 billion

  Formation of planet Earth.

  3.8 billion

  Emergence of organisms. Beginning of biology.

  6 million

  Last common grandmother of humans and chimpanzees.

  2.5 million

  Evolution of the genus Homo in Africa. First stone tools.

  2 million

  Humans spread from Africa to Eurasia. Evolution of different human species.

  500,000

  Neanderthals evolve in Europe and the Middle East.

  300,000

  Daily usage of fire.

  200,000

  Homo sapiens evolves in East Africa.

  70,000

  The Cognitive Revolution. Emergence of fictive language. Beginning of history. Sapiens spread out of Africa.

  45,000

  Sapiens settle Australia. Extinction of Australian megafauna.

  30,000

  Extinction of Neanderthals.

  16,000

  Sapiens settle America. Extinction of American megafauna.

  13,000

  Extinction of Homo floresiensis. Homo sapiens the only surviving human species.

  12,000

  The Agricultural Revolution. Domestication of plants and animals. Permanent settlements.

  5,000

  First kingdoms, script and money. Polytheistic religions.

  4,250

  First empire – the Akkadian Empire of Sargon.

  2,500

  Invention of coinage – a universal money.

  The Persian Empire – a universal political order ‘for the benefit of all humans’.

  Buddhism in India – a universal truth ‘to liberate all beings from suffering’.

  2,000

  Han Empire in China. Roman Empire in the Mediterranean. Christianity.

  1,400

  Islam.

  500

  The Scientific Revolution. Humankind admits its ignorance and begins to acquire unprecedented power. Europeans begin to conquer America and the oceans. The entire planet becomes a single historical arena. The rise of capitalism.

  200

  The Industrial Revolution. Family and community are replaced by state and market. Massive extinction of plants and animals.

  The Present

  Humans transcend the boundaries of planet Earth. Nuclear weapons threaten the survival of humankind. Organisms are increasingly shaped by intelligent design rather than natural selection.

  The Future

  Intelligent design becomes the basic principle of life? Homo sapiens is replaced by superhumans?

  Part One

  The Cognitive Revolution

  1. A human handprint made about 30,000 years ago, on the wall of the Chauvet-Pont-d’Arc Cave in southern France. Somebody tried to say, ‘I was here!’

  {© ImageBank/Getty Images Israel.}

  1

  An Animal of No Significance

  ABOUT 13.5 BILLION YEARS AGO, MATTER, energy, time and space came into being in what is known as the Big Bang. The story of these fundamental features of our universe is called physics.

  About 300,000 years after their appearance, matter and energy started to coalesce into complex structures, called atoms, which then combined into molecules. The story of atoms, molecules and their interactions is called chemistry.

  About 3.8 billion years ago, on a planet called Earth, certain molecules combined to form particularly large and intricate structures called organisms. The story of organisms is called biology.

  About 70,000 years ago, organisms belonging to the species Homo sapiens started to form even more elaborate structures called cultures. The subsequent development of these human cultures is called history.

  Three important revolutions shaped the course of history: the Cognitive Revolution kick-started histor
y about 70,000 years ago. The Agricultural Revolution sped it up about 12,000 years ago. The Scientific Revolution, which got under way only 500 years ago, may well end history and start something completely different. This book tells the story of how these three revolutions have affected humans and their fellow organisms.

  There were humans long before there was history. Animals much like modern humans first appeared about 2.5 million years ago. But for countless generations they did not stand out from the myriad other organisms with which they shared their habitats.

  On a hike in East Africa 2 million years ago, you might well have encountered a familiar cast of human characters: anxious mothers cuddling their babies and clutches of carefree children playing in the mud; temperamental youths chafing against the dictates of society and weary elders who just wanted to be left in peace; chest-thumping machos trying to impress the local beauty and wise old matriarchs who had already seen it all. These archaic humans loved, played, formed close friendships and competed for status and power – but so did chimpanzees, baboons and elephants. There was nothing special about humans. Nobody, least of all humans themselves, had any inkling that their descendants would one day walk on the moon, split the atom, fathom the genetic code and write history books. The most important thing to know about prehistoric humans is that they were insignificant animals with no more impact on their environment than gorillas, fireflies or jellyfish.

  Biologists classify organisms into species. Animals are said to belong to the same species if they tend to mate with each other, giving birth to fertile offspring. Horses and donkeys have a recent common ancestor and share many physical traits. But they show little sexual interest in one another. They will mate if induced to do so – but their offspring, called mules, are sterile. Mutations in donkey DNA can therefore never cross over to horses, or vice versa. The two types of animals are consequently considered two distinct species, moving along separate evolutionary paths. By contrast, a bulldog and a spaniel may look very different, but they are members of the same species, sharing the same DNA pool. They will happily mate and their puppies will grow up to pair off with other dogs and produce more puppies.

  Species that evolved from a common ancestor are bunched together under the heading ‘genus’ (plural genera). Lions, tigers, leopards and jaguars are different species within the genus Panthera. Biologists label organisms with a two-part Latin name, genus followed by species. Lions, for example, are called Panthera leo, the species leo of the genus Panthera. Presumably, everyone reading this book is a Homo sapiens – the species sapiens (wise) of the genus Homo (man).

  Genera in their turn are grouped into families, such as the cats (lions, cheetahs, house cats), the dogs (wolves, foxes, jackals) and the elephants (elephants, mammoths, mastodons). All members of a family trace their lineage back to a founding matriarch or patriarch. All cats, for example, from the smallest house kitten to the most ferocious lion, share a common feline ancestor who lived about 25 million years ago.

  Homo sapiens, too, belongs to a family. This banal fact used to be one of history’s most closely guarded secrets. Homo sapiens long preferred to view itself as set apart from animals, an orphan bereft of family, lacking siblings or cousins, and most importantly, without parents. But that’s just not the case. Like it or not, we are members of a large and particularly noisy family called the great apes. Our closest living relatives include chimpanzees, gorillas and orang-utans. The chimpanzees are the closest. Just 6 million years ago, a single female ape had two daughters. One became the ancestor of all chimpanzees, the other is our own grandmother.

  Skeletons in the Closet

  Homo sapiens has kept hidden an even more disturbing secret. Not only do we possess an abundance of uncivilised cousins, once upon a time we had quite a few brothers and sisters as well. We are used to thinking about ourselves as the only humans, because for the last 10,000 years, our species has indeed been the only human species around. Yet the real meaning of the word human is ‘an animal belonging to the genus Homo’, and there used to be many other species of this genus besides Homo sapiens. Moreover, as we shall see in the last chapter of the book, in the not so distant future we might again have to contend with non-sapiens humans. To clarify this point, I will often use the term ‘Sapiens’ to denote members of the species Homo sapiens, while reserving the term ‘human’ to refer to all extant members of the genus Homo.

  Humans first evolved in East Africa about 2.5 million years ago from an earlier genus of apes called Australopithecus, which means ‘Southern Ape’. About 2 million years ago, some of these archaic men and women left their homeland to journey through and settle vast areas of North Africa, Europe and Asia. Since survival in the snowy forests of northern Europe required different traits than those needed to stay alive in Indonesia’s steaming jungles, human populations evolved in different directions. The result was several distinct species, to each of which scientists have assigned a pompous Latin name.

  2. Our siblings, according to speculative reconstructions: Homo rudolfensis (East Africa); Homo erectus (East Asia); and Homo neanderthalensis (Europe and western Asia). All are humans.

  {© Visual/Corbis.}

  Humans in Europe and western Asia evolved into Homo neanderthalensis (‘Man from the Neander Valley’), popularly referred to simply as ‘Neanderthals’. Neanderthals, bulkier and more muscular than us Sapiens, were well adapted to the cold climate of Ice Age western Eurasia. The more eastern regions of Asia were populated by Homo erectus, ‘Upright Man’, who survived there for close to 2 million years, making it the most durable human species ever. This record is unlikely to be broken even by our own species. It is doubtful whether Homo sapiens will still be around a thousand years from now, so 2 million years is really out of our league.

  On the island of Java, in Indonesia, lived Homo soloensis, ‘Man from the Solo Valley’, who was suited to life in the tropics. On another Indonesian island – the small island of Flores – archaic humans underwent a process of dwarfing. Humans first reached Flores when the sea level was exceptionally low, and the island was easily accessible from the mainland. When the seas rose again, some people were trapped on the island, which was poor in resources. Big people, who need a lot of food, died first. Smaller fellows survived much better. Over the generations, the people of Flores became dwarves. This unique species, known by scientists as Homo floresiensis, reached a maximum height of only 3.5 feet and weighed no more than fifty-five pounds. They were nevertheless able to produce stone tools, and even managed occasionally to hunt down some of the island’s elephants – though, to be fair, the elephants were a dwarf species as well.

  In 2010 another lost sibling was rescued from oblivion, when scientists excavating the Denisova Cave in Siberia discovered a fossilised finger bone. Genetic analysis proved that the finger belonged to a previously unknown human species, which was named Homo denisova. Who knows how many lost relatives of ours are waiting to be discovered in other caves, on other islands, and in other climes.

  While these humans were evolving in Europe and Asia, evolution in East Africa did not stop. The cradle of humanity continued to nurture numerous new species, such as Homo rudolfensis, ‘Man from Lake Rudolf’, Homo ergaster, ‘Working Man’, and eventually our own species, which we’ve immodestly named Homo sapiens, ‘Wise Man’.

  The members of some of these species were massive and others were dwarves. Some were fearsome hunters and others meek plant-gatherers. Some lived only on a single island, while many roamed over continents. But all of them belonged to the genus Homo. They were all human beings.

  It’s a common fallacy to envision these species as arranged in a straight line of descent, with Ergaster begetting Erectus, Erectus begetting the Neanderthals, and the Neanderthals evolving into us. This linear model gives the mistaken impression that at any particular moment only one type of human inhabited the earth, and that all earlier species were merely older models of ourselves. The truth is that from about 2 million years ago until
around 10,000 years ago, the world was home, at one and the same time, to several human species. And why not? Today there are many species of foxes, bears and pigs. The earth of a hundred millennia ago was walked by at least six different species of man. It’s our current exclusivity, not that multi-species past, that is peculiar – and perhaps incriminating. As we will shortly see, we Sapiens have good reasons to repress the memory of our siblings.

  The Cost of Thinking

  Despite their many differences, all human species share several defining characteristics. Most notably, humans have extraordinarily large brains compared to other animals. Mammals weighing 130 pounds have an average brain size of 12 cubic inches. The earliest men and women, 2.5 million years ago, had brains of about 36 cubic inches. Modern Sapiens sport a brain averaging 73–85 cubic inches. Neanderthal brains were even bigger.

  That evolution should select for larger brains may seem to us like, well, a no-brainer. We are so enamoured of our high intelligence that we assume that when it comes to cerebral power, more must be better. But if that were the case, the feline family would also have produced cats who could do calculus, and frogs would by now have launched their own space program. Why are giant brains so rare in the animal kingdom?

  The fact is that a jumbo brain is a jumbo drain on the body. It’s not easy to carry around, especially when encased inside a massive skull. It’s even harder to fuel. In Homo sapiens, the brain accounts for about 2–3 per cent of total body weight, but it consumes 25 per cent of the body’s energy when the body is at rest. By comparison, the brains of other apes require only 8 per cent of rest-time energy. Archaic humans paid for their large brains in two ways. Firstly, they spent more time in search of food. Secondly, their muscles atrophied. Like a government diverting money from defence to education, humans diverted energy from biceps to neurons. It’s hardly a foregone conclusion that this is a good strategy for survival on the savannah. A chimpanzee can’t win an argument with a Homo sapiens, but the ape can rip the man apart like a rag doll.