2 . When water is cold, people will find it uncomfortable to swim. Wetsuits(潜水服）can help keep people warm.    1    So wetsuits are important. In many water sports, you can find people wearing them.

The wetsuit doesn't have a long history. According to studies, the wetsuit only began during WWII when Italians started wearing wetsuits that were made of rubber. And it was widely believed in 1951, Hugh Bradner began working to improve the equipment.     2    

Now there are many kinds of wetsuits. Contrary to what some may think, wetsuits do not work by keeping the diver(潜水员）dry; they are designed to let water into the suit. This thin layer of water is trapped（保存）between the diver and the suit. And it's allowed to move between the skin of the diver and the inside layer.     3    And it can help keep the diver comfortable during the diving process. That's why it's important to have a nice, tight fit for a wetsuit.

    4    The shorter wetsuit often provides cover for the main part of people's bodies. This kind of wetsuit works well with boating, water skiing, swimming, etc. A longer wetsuit can completely cover the body, including long legs.With more protection for the body, it may be used in cool weather conditions.

Wetsuits can also differ in thickness. They range from about 0. 5mm to 8mm in thickness. It's true that thicker wetsuits are more likely to affect your movement.     5    Generally, the colder the water you plan to dive in, the thicker the wetsuit should be.

4 . There’s a child-like joy that comes with ordering something online — whether it be clothes or kitchen facilities. We sit refreshing the postal service to see when our items will arrive, and we become overly excited, hopeful and anxious.

Ryan Howes, a clinical psychologist from Pasadena California, has interpreted this phenomenon as “anticipatory pleasure”. “A lot of people believe that placing that order and waiting for it does feel good. This is why people look forward to dinner reservations, hair appointments and yes, receiving packages,” he says.

But it’s not the purchase itself that brings about this happiness. Experts say there’s something about the anticipation of waiting that is exciting for those in need of change in their lives. “It can be helpful to anticipate good things in the future, ’’says Ryan Howes. “Waiting for a parcel can serve as a temporary distraction (分心) from the dullness of your life because it gives you something new to wake up to and get excited about.”

However, anticipatory pleasure isn’t always a good thing. While waiting, many are worried about their items arriving on time, appearing broken, or simply not living up to expectations. Even when our package finally arrives, you’ll find that initial excitement has probably waned. Howes cautions that comfort shopping is only a temporary fix. It’s just a distraction from bigger problems, but it hasn’t done anything to change the bigger problems. It only helps you escape from them temporarily.

“Many people often seek external solutions, such as luxury purchases or alcohol, as a way of feeling better quickly. However, a healthier long-term curing mechanism is to look inward and appreciate your life with gratitude. Real pleasure comes from taking action rather than wait passively.” Howes says.

So the next time you feel the urge to order and track something online, chew over it.

6 . Simple Tips to Increase Self-Confidence

Having confidence begins with having a mind full of confident thoughts. A mind is controlled by you, therefore believing only the things that will bring you things you desire. Almost anyone in the world can have confidence.     1    . It is a matter of following these easy steps.

Set goals

It’s a great idea to keep a “Goals Book” and every time something enters your mind you’d like to achieve, list it in the book. Soon you’ll see a pattern among all your goals.     2    , you begin to see simple changes in your life. There is no greater joy in life than to realize a goal.

    3    

People usually can’t tell you how you should live your life when it’s just an expression of their own shortcomings. Don’ allow the shortcomings of others to affect your life negatively. No one but you knows your interests and ambitions. Work in the direction of your true loves and ignore everything that enters your mind going against your own desires.

Challenge your beliefs

    4    . If they are not, cross them out. You may find it difficult to get rid of some of the deep-rooted beliefs, but with true desire you can abandon negative beliefs about yourself and you will realize enormous benefit in growing self-confidence and self-esteem.

Get started

Don’t expect changes right away and have patience in knowing that it takes time to be the person you wish to be. The wonderful thing about becoming a more self-confident person is that little benefits start taking shape almost immediately.     5     — as long as you continue to keep a positive outlook and display your confidence.

As you achieve confidence, and find little moments of confidence coming closer and closer, all the things you desire will come to you easier than you ever imagined.

7 . On a sunny afternoon, Andreas Fath climbed out of a river in Paducah. A small crowd was on hand to witness his setting a new world record. This man had just finished swimming the entire length of the Tennessee River—1,049 kilometers. And he did it in just 34 days!

As a chemist from Hochshule Furtwangen University, the 52-year-old man had taken on this swim for science. His primary goal was not to get his name into Guinness World Records. What really drove this swim was a desire to make people aware of the seriousness of water pollution.

Fath’s crew included his family. Martin Knoll, who helped organize Fath’s swim, also took par t. Knoll is an environmental scientist at the University of the South. He describes this swim as a vehicle for getting people interested in water quality and how we pollute water without realizing it.

It took Fath 34 days to swim the river’s length. Along the way, his crew took measurements of the water’s temperature and pH. They also recorded weather and the speed of the river’s currents (涌流). As for the Tennessee River, they collected daily water samples. A small plastic device attached to one leg of Fath’s wet suit sampled the chemical pollutants (污染物) through which he swam. Finally, Fath’s goal is to use such data to know what on earth results in water pollution. Then he wants to find ways to keep those chemicals out of the water.

Back in Germany, Fath and his students have finished examining their data. They plan to publish their findings soon. Identifying materials that hide in the river isn’t only important for the animals that live there. “It’s also a way to protect human health,” says Fath.

9 . I have met many people, but I will always remember my teacher, Mrs. Lawrence.

I will remember Mrs. Lawrence for her good character. She is always nice and helpful to the students. She will take every chance to praise the students that are not so good in class. I wish I could have the same great character as her.

I will always remember the great moments when we are together. Once I stayed in her room for several days and it was really enjoyable. I love to listen to all the stories and things about her.

I also like her creativity(创造力). We don’t like boring books, music, pictures, students and so on. She teaches us about these boring things in ways that we like. I also enjoy the way she asks us to be quiet while she is talking at the front of the classroom. She will give us a lovely little flower when we do something well. The student that has got the most flowers at the end of the month will receive gifts like pies, drinks and chips.

I will never forget Mrs. Lawrence. She has taught me to always be a person of good character, even if I'm angry. She has taught me just to have fun and not to worry. She has also taught me to be creative and enjoy what I do. That is why I will remember Mrs. Lawrence forever.

10 . Human beings use animals for a lot of purposes, including research. By studying animals, it is possible to learn information that cannot be learned in any other way. Animals are used in research when there is a need to find out what happens in the whole living body. There are four main reasons why animals are used in research.

Adding to scientific knowledge through basic biological research helps us understand how living things work, and use that understanding for the benefit(利益)of both humans and animals. The study of animals is an important part of the whole research process. The bodies of animals are like humans’ in the way that they perform many important functions(功能) such as breathing, movement, sight, and hearing. To treat disease, doctors and scientists must understand how the healthy body works.

Humans and animals share hundreds of illnesses, so animals can act as models for the study of human illness. For example, rabbits suffer form emphysema, a lung problem that makes it hard to catch their breath. Dogs suffer from cancer, bleeding disorders and so on. Cats suffer from some of the same vision loss as humans. From such models we learn how diseases affect the body and more.]

Once researchers learn more about a particular disease, animals are used to develop and test the treatments. For example, medicines for Parkinson’s disease have been developed by using animal models with Parkinson’s-like symptoms(症状). Models such as these are an important part of using biological research to solve real medical problems.

New medicines need testing because researchers must test both the beneficial and the harmful effects of a medicine on a living body. A medicine must be tested in a suitable animal model before clinical trials(临床试验) in humans can take place.