Yesterday evening, Professor Hugo de Garis, known as the "father of artificial brain", came into Tsinghua University lecture hall. During his two-hour speech, he described an "artificial intelligence world" to everyone: "Possibly 20 or 30 years later, artificial intelligence machines can make friends with human beings. But 50 years later, artificial intelligence will be the biggest threat to mankind. The world will eventually break out in a war due to surpassing of artificial intelligence over human intelligence. Perhaps billions of people will lose their lives in this intelligent war."