How do you feel about nature? After spending hours indoors, do you feel better when you visit your local park? Most people think that nature is good for our bodies and brains. However, humans are spending more time inside and less time outside. For example, the number of visitors to Canada’ national parks is getting lower every year. And in countries such as the USA, only 10% of teenagers spend time outside every day. Many doctors feel that this is a problem in the twenty-first century.

As a result, some doctors are studying the connection between nature and health: one example of this is the work of Dr Matilda in Sweden. The doctor gave people a maths test. During the test, their heart rates were fast. After the test, one group of people sat in a 3D-virtual-reality room for fifteen minutes with pictures and sounds of nature. Their heart rates were slower than people’s in the other group.

The virtual touch with nature helped them feel more relaxed. Another good example of how nature is good for health comes from Canada. In Toronto, researchers studied 31, 000 people living in the city. In general, they found that healthier people lived near parks.

Because of studies like these, some countries and cities want nature to be part of people’s everyday life. In Dubai, for example, there are plans for a new shopping mall with a large garden so shoppers can relax outside with trees, plants and water. In Switzerland, “forest schools” are popular. School children study their subjects in the forests and do lots of exercise outside. And South Korea is another good example: it has new forests near its cities and around 13 million people visit these forests every year. So after building cities for so long, perhaps it’s now time to start rebuilding nature.

Big data (数据) is a lot of sets of information that are put together so they can be used by a computer programme. The computer programme looks for different kinds of answers or patterns in the data. Big data can have different kinds of information from many sources, such as information that comes from schools, social media sites, companies and governments. 【小题1】 Another set can have what they like, where they go, and how much time they spend on the computer.

【小题2】 The government uses it to understand how many people travel on buses or trains. This information is then used to make bus or train systems better. Some schools use big data to understand which children may need extra help in class. The teacher can then give certain students more help or support so those students can succeed in school. Companies use big data, too.

【小题3】 For example, one company uses weather data to see when people eat the most ice creams.

Big data can be used for different purposes. Some hospitals use big data to predict if a baby who is born too early will get sick. 【小题4】 It can also be used to predict which kinds of people are likely to break the law or hurt others, even if they have not done anything wrong.

Why can big data be used for various purposes? It is because the computer programs used to read and understand big data are written by people who think in a certain way. They build a model of those ideas. The model is then used to read the data. Sometimes, good ideas are helpful for people or business. 【小题5】

We've seen 3D films, 3D TVs and so on. They are so interesting that young people like to watch them very much. Have you ever read about 3D newspapers? That was what the Belgian (比利时的) newspaper, La Derniere Heure, tried to do for its readers. This was Europe's first 3D newspaper.

It took the team two months to make the 3D newspaper. The team printed 11, 500 copies of the special edition of La Derniere Heure. It was more than the usual number of the printed copies.

Each of these newspaper came with a pair of free 3D glasses. All the photos and ads in the newspaper were in 3D and the text was the same as usual. Readers could get the best result by holding the paper 50 cm away from the eyes. In fact, if people don't wear the 3D glasses, the newspaper will be terrible to read because the images are not clear.

Many readers tried to buy this kind of newspaper. In fact, some of them bought it just for fun. The publishers (出版商) had no plans to continue it because it cost too much.