Why do people cry? Scientists say the body produces(产生)tears because it needs them. One kind of tears(眼泪)is for the eye， the other is for the heart. They both work as cleaners. If something else like dust(灰尘)gets into your eye， tears also come into the eye to clean it out. If you are hurt by something，your strong feelings produce some poisonous chemicals(毒素)in your body， and at the same time， tears come out with them. If tears don't help clean out these poisonous chemicals， they will do harm to(伤害)the heart.

    In the United States men have heart problems more often than women do. Doctors say heart problems have something to do with the pressures(压力)of living and working now. Perhaps men have more of these illnesses because they do not cry enough. They need to cry more.

    In fact，you can find many ways of reducing(减少)the pressures to keep fit. Crying is a natural(自然)and physical(生理)one.

    Some people seem to have unusual memories. Zheng Aiqiang, a "memory athlete" on TV show Super Brain, can remember 2,660 numbers in just one hour!

    You would think people like him must have special brains. But according to a recent study by researchers from America and Holland, the brain structure (结构) of ordinary people and 23 of the world's leading memory athletes shows no difference.

    Good memories can be trained. New research in the magazine Neuron suggests that a person will get a super memory with just six weeks of hard training.

    Researchers found that a technique (技巧) called loci, invented by the ancient Greeks, can greatly help improve memory.

    By using loci, you are using your imagination to improve the brain's memory networks. You can link (关联) something you need to remember with a place that you know very well. For example, to remember a list of numbers, imagine yourself walking through your house. Each thing is linked to a number. For example, zero could be the handle on the door and five could be the painting on the wall.

    In one study, some ordinary people were given 20 minutes to remember 72 nouns. At the beginning, they could only remember 26 words, but when they were taught loci, they could remember 62 words.

    "Not everyone can become a memory winner. But everyone using the technique can improve his memory greatly," said Boris Konrad, one of the researchers in the study.

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    Do you like travelling? How can you make your trip interesting? Here's some advice.

    Read!

    Before you leave, you should find some information about the place, such as geography, history and people. You can understand the place better by reading.

    Take photos!

    If you want to take some photos, remember to choose the most special sights. Don't choose the sight you can see in other places. For example, Qingdao and Ningbo arc coastal（海滨的）cities, so don't only take photos of the sea.

You should talk photos of something else, too.

    Taste!

    You'd better taste some specials in the area. Food in some places is very delicious. So why not taste it? Maybe you have just one chance to taste it in your life.

    Write!

    When you visit a place, you should take a pen and a notebook, so you can write down that you see and what you think during the trip.

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    Last month I got the chance to take part in an underwater research project in an area of the Gulf of Mexico called the Flower Gardens. A team of professional researchers were trying to learn more about the fish and other animals that live in this part of the sea. The Flower Gardens are a long way from the shore(海岸) and we spent three days on a boat.

    The team used a piece of underwater equipment to collect information. This underwater equipment is called a Remotely Operated Vehicle (ROV). The ROV could measure water depth and temperature and it also had a camera that sent live film back to the boat. The ROV was great fun. It was controlled by a computer on the boat, and I was allowed to operate it a few times.

    However, the thing I enjoyed most was diving into the water. At first, I was quite frightened—mainly because I couldn't see land in any direction. But as soon as I jumped into the water, I wasn't afraid anymore. It was amazing to see the colourful fish swimming around and I could see all the way to the Flower Gardens, which are almost 30 metres down.

    I will never forget the Flower Gardens. The trip was like a holiday but I also learnt new things about science and research projects. The team were very friendly and everyone was happy to explain what they knew about the sea. It was a great opportunity and it has made me think about my goals in life. The experience will surely encourage me to work harder to become a scientist.

   In thetime it takes you to read this sentence, the population of the Earth will have grownby 10 people. That may not sound much, but it is about 14,000 people an hour. Thatis the same as adding most of the population of Germany to the world every year!

   Most of these new people are born in developing countries. These countriesare found in much of Africa, South America, and parts of Asia. In the developedcountries of Europe and North America, the population is growing very slowly. Thisis because women in these countries have, on average, only one or two children.In the developing countries, many women have five or more children. In 1950, aroundone quarter of the world's population lived in the developed countries. By 2050,these countries will be the home to only around one tenth of the world's people.

   In the developing countries, more than one billion people already live belowthe poverty line (贫困线).These people don't have enough food to eat and they live in poor housing;children get little or no time at school and suffer from many kinds of diseases.

   The United Nations (UN) tries to guess population growth. At the beginningof the 21st century, the world's population was around six billion people. The UNhas said that the world's population will level off at 12. 5 billion people by theyear 2100. Other people think the world's population will continue to grow, reaching14 billion people before it becomes stable or even falls.