Yuval Noah Harari

What's more valuable - intelligence or consciousness?

You have to know how to co-operate with other people if you want to stay alive and raise children. And to do that, you need to know something about them. You need to know who loves whom, who hates whom, who is sleeping with whom. Who is honest, who is a cheat.

In order to survive in a very small tribe, you needed to know how to do lots of things for yourself: how to make your tools, how to get food, and how to make your clothes - things most of us today don't need to know. The only thing I need to survive is to know history.

For thousands of years, until about 1850, you see humans accumulating more and more power by the invention of new technologies and by new systems of organization in the economy and in politics, but you don't see any real improvement in the well-being of the average person.

About 15,000 years ago, humans colonised America, wiping out in the process about 75% of its large mammals. Numerous other species disappeared from Africa, from Eurasia, and from the myriad islands around their coasts. The archaeological record of country after country tells the same sad story.

My main ambition as a historian is to figure out what's really happening in the world, instead of the fictions that humans have been creating for thousands of years in order to explain or control what's happening in the world.

For many centuries, even thousands of years, patriotism worked quite well. Of course, it led to wars an so forth, but we shouldn't focus too much on the bad.

When the first humans reached Australia about 45,000 years ago, they quickly drove to extinction 90% of its large animals. This was the first significant impact that Homo sapiens had on the planet's ecosystem. It was not the last.

Our bodies and minds evolved and were adapted for hundreds of thousands of years for tasks like climbing a tree and picking apples, or hunting rabbits, or looking for mushrooms in the forest. They were not adapted to the very gruelling work that is involved in field work - ploughing, harvesting, bringing water, digging weeds - things like that.

For thousands of years, we have gained the power to control the world outside us but not to control the world inside. You could stop a river from flowing, but you could not stop your body from becoming old. You could kill mosquitoes, but you could not kill annoying thoughts buzzing inside your head.

Ignorance is not too dangerous. If you combine it with power, then this is a toxic mix.

Most people, they get overwhelmed by the religious stories, the nationalist stories, by the economic stories of the day, and take these stories to be the reality.

Money is the probably the most successful story ever told. It has no objective value... but then you have these master storytellers: the big bankers, the finance ministers... and they come, and they tell a very convincing story.

You take fantasies, which for thousands of years belonged to the religious realm - overcoming death or our merging with the universe - and you suddenly start talking about them in a more technical perspective as something that can be achieved, not after you die with the help of supernatural beings, but in this very life with the help of technology.

Humanist thinkers such as Rousseau convinced us that our own feelings and desires were the ultimate source of meaning and that our free will was, therefore, the highest authority of all.

Fundamentally, mankind was unimportant in the ecological system. Then, in one fell swoop, an evolutionary blink of an eye, the human race is transformed from something unimportant to the most important thing in the world.

Many people in their teens wonder about these big questions - what's the meaning of life, what are we doing here - then somewhere in their 20s, they seem to say, 'I'll just get married. I'll just have kids. I'll get back to that later.' But they never do. For me, it kept boiling.

People have long feared that mechanization might cause mass unemployment. This never happened because, as old professions became obsolete, new professions evolved, and there was always something humans could do better than machines. Yet this is not a law of nature, and nothing guarantees it will continue to be like that in the future.

All animals communicate. What's special about gossip is that it's not about the here and now. You don't gossip about lions. You don't gossip about clouds. You only gossip about other people. And once you do, you can keep track of many more people - this is the basis for forming larger communities.

I was taught that if you're going to study something, you must understand it deeply and be familiar with primary sources. But if you write a history of the whole world, you can't do this. That's the trade-off.

The widespread assumption is that somehow, the brain produces the mind; somehow millions of neurons fire signals at one another create or produce consciousness... but we have no idea how or why this happens. I'm afraid that in many cases, people in the tech world fail to understand that.