Don't be too surprised if you see a car going down the road without a driver in Beijing these days. {#blank#}1{#/blank#}Last month, Baidu began to test its self-driving cars on open roads in Beijing.

    {#blank#}2{#/blank#}Since then, companies like Tesla, Uber and Baidu have been working to produce and test their own self—driving cars.

    Self-driving cars are safer than regular cars. {#blank#}3{#/blank#}They can remove the stress of driving and allow disabled or blind people to get around more easily.

    {#blank#}4{#/blank#}In one test, researchers pointed a laser pointer (激光棒) at the car's sensors (传感器) while it was moving. The car mistakenly thought that the laser beam was in its way and slowed down or changed the direction.

    The software that is used to direct the cars may not be safe enough. {#blank#}5{#/blank#}When we use our computers or smartphones, they sometimes crash (崩溃) without any reason. But if this happened to a self-driving car, the result could be deadly. Improvements to the software could be a solution to this problem.

The Terracotta Warriors, one of the eight wonders of the world, have enjoyed international fame. Located in Xi'an in northwest China's Shaanxi Province, they are warriors of the first-ever emperor in1China or Qin Shi Huang in Chinese, Ying Zheng.

Even though I knew they are life-sized sculptures (雕塑), I was still2 when I saw them. I was lucky enough to3 the pit (深坑) and take a close look at them for the first time.

They were made around 2, 200 years ago. When I first got down into the pit, the sculptures scared me4some of them lacked body parts.

I was told that the Terracotta Warriors are not easy to preserve (保存;保护) for over thousands of years. But to my surprise, they were actually5 in color when they were first discovered. However, the color fell off6after being exposed in the air.

The difficulty of preservation is one of the reasons why they have stopped7out other pits. Although the Terracotta Warriors are breathtaking, they are only part of the Mausoleum (陵墓) of the First Qin Emperor.

Shen Wenxi, an expert and museum librarian of the Chinese Academy of Social Sciences, told me there's an even grander area8 man-made mountains, rivers and seas inside the emperor' s underground palace.

However, there is no plan to dig them until there are perfect9of protecting and preserving them. Experts are still busy restoring the relics (修复文物) that were10in the 1970s.

"Robots, drones(无人机) and AI will do around 90% of the housework by 2040, " scientists from King's College said. 

Mischa Dohler and Dr. Ian Pearson wrote a report to predict what homes will look like in 20 years. In it, they said that housework like washing the clothes and doing the dishes would be much easier because of technology progress(进步). If technology kept making progress, they expected that people would spend less than two hours a day in doing housework. 

But most British people still don't believe their predictions. Just 2/5 of the people think that house robots will become a reality(现实) by 2040. 

Maybe you need to tell bad news to your parents.Maybe you're feeling worried about something.You want to talk with them，but you don't know how to do that.Here are some suggestions （建议） for you.

{#blank#}1{#/blank#}

Cook，eat，play，or just hang out （闲逛） together.This will give you a chance to have a nice talk.

{#blank#}2{#/blank#}

Do you want to tell them something important or ask for help？Do you need their advice？It helps if you're clear about what you want.Put it into words.For example： "I need your advice.Can we talk？"

{#blank#}3{#/blank#}

Are you worried about their reaction （反应）？Are you afraid that they'll be angry？Don't let those feelings stop you.Instead，let your feelings be part of the talk.For example： "I have something to tell you.You might be angry，but I need to tell you."

{#blank#}4{#/blank#}

If you think you might get nervous when it's time to talk，try practicing.It can help you feel more comfortable （舒服的） when you're talking.

{#blank#}5{#/blank#}

Find a time when your parents are happy.You can ask， "Can we talk？Is now a good time？" And then，just get started.

These days, more and more people like the "city walk" around China. The city walk is a kind of city tour coming from the UK. It means tourists follow a planned route（路线）working deeply on the city's history and culture. During the traditional kind of travel, people need to follow a group of people. But city walk routes are special for every tourist. People probably choose a route on their own and move on foot without a purpose（目的）. They can also talk with locals（当地人）and taste local food on their way. 

City walkers may be tourists from other places or local young people. For tourists, by taking part in a city walk, they can learn the city's history and culture. For the local young people, they may spend weekends knowing more about their living places. And they even share their routes and places online. So more people get interested in their cities and come to visit them. 

Now the city walk is very hot. However, we also find that to make money, some travel agencies（旅行社）may make some routes without understanding the culture and history of a city. That will make tourists lose interest in the city walk. What's more, many young people spend much time taking photos to just show themselves online. 

The Feyman Technique(费曼学习法) was developed by Nobel Prize-winning physicist(物理学家) Richard Feynman. It's a study method that helps students learn by teaching others. 

 The Feyman Technique has been one of the most effective study methods for many years. For one thing, it helps students really understand something instead of just memorizing information. Plus, unlike traditional study methods like re-reading textbooks or reviewing notes. it pushes students to be more actively mvolved(参与) u n the learning process, 

 If you want to use the Feynman Technique to study better, follow these steps. To begin with, choose a topic you want to learn, including sub-topics(子主题). If not, you' ll end up jumping between topics without developing a deeper understanding of any of them. 

 The second step is the heart of the Feynman Technique: explaining the topic simply enough to be understood by a sixth-grade student. This requires you to help the child understand by using the simplest and clearest language. This step helps divide indigestible topics into their most basic parts. 

Next, review your explanation and try to find any area where you felt that you couldn't explain the topic simply. When possible, it can be very helpful to get advice from someone whose understanding is similar to that of a sixth-grader. 

The fourth step is to improve your explanation using the information collected from the third step. Finally, repeat the steps. The Feynman Technique works best with repetition, and that is why going through all the prior(先前的) steps just once is usually not enough to fully understand the topic. 

 Once you' re confident you' ve learned the topic, it's time to give yourself-a prize. Perhaps, like me, enjoy a nice cup of coffee.