For people, it's not surprising that we can open a door, lift a heavy box and control ourselves while walking in the snow. But can a robot do these? Well, Google's new robot, Atlas, can not only do these things, but it can stand up if it falls down. Although the robot may be slow and clumsy, it was created（被创造）mainly to work in dangerous places for humans.

Now, robots are much smarter than you might imagine. On March 9 this year, AlphaGo, an artificial intelligence（人工智能）program made by Google's DeepMind, challenged top professional Go player Lee Sedol from South Korea. And AlphaGo beat（击败）Lee at last.

AI is when computers or computer software is able to have intelligent behavior, such as thinking or acting like a human. In our daily life, we already use AI in many ways, such as Apple's Siri and search engines（搜索引擎）like Baidu and Google.

Some people may worry whether computers are now smart enough to beat us at everything. But experts say that is not the case. Real life problems can be more difficult than the Go game. For example, humans can watch a person throw down a cup of coffee and know that the result will be a mess on the floor. A computer program would have to know the size of the cup, the height of the cup from the floor and many other things to find out the result. But we never know what will happen in the future.