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 . Whether you’re in the final research stages of a major paper, or on a Zoom (a calling app) call for work, a dropped WiFi connection at zero hour is something annoying.     1     One of the most common reasons it happens is that too many devices are connected.

    2     Now, with smartphones, iPads, smart TVs and so much more, it doesn’t take long for WiFi to hop aboard the struggle bus. Actually, even if a connected device isn’t actively sending or receiving data, it will still consume some of the available bandwidth. It means that if you have many devices connected, you can start to see slowdowns or drops in your WiFi connection.     3    

The first and easiest fix is to disconnect unused devices from your WiFi. The easiest way to do this is to simply change your WiFi password, which will kick everyone off. Then, you can allow only certain devices to rejoin.     4     It is workable to stop gaming or downloading a movie.

    5     First, run a speed test to check your current speed. (Google “speed test” to see a list of websites where you can do this.) You may have too many devices connected for the internet speed you’re paying for. If this is the case, contact your internet provider about upgrading to a higher speed. But you may want to try some of our other fixes first before spending the money.

5 . We all know what a brain is. A doctor will tell you that the brain is the organ (器官) of the body in the head. But a brain can mean so much more.

To tease is to make fun of someone. But a brainteaser is not one who makes fun of someone else’s brain. A brainteaser is a puzzle that makes you think.

To understand the next brain expression you first need to know the word “drain”. As a verb, to drain means to remove something by letting it flow away. So, a brain drain may sound like a disease where the brain flows out the ears. But a brain drain is when a country’s most educated people leave their country to live in another.

Next, we have a brainchild. A brainchild sounds like a really smart kid. But it isn’t. A brainchild is an idea that one has without any help from others. If you have a really great idea, it is your brainchild — no one else’s.

However, if many people are responsible for a great idea, you can say they brainstormed it. It is a process of thinking creatively about a difficult topic. For example, business leaders may use brainstorming to create new products.

But if you can’t find a solution to a problem, you may have to rack your brains. In this way, you may find a solution. Sometimes, you have to rack your brains, trying to remember someone’s name.

Now, if people are brainwashed, it does not mean their brains are nice and clean. To brainwash means to make someone accept new ideas by using repeated pressure in a forceful way. Keep in mind that brainwash is never used in a positive way.

6 . When Byron Thanarayen and his wife Melissa returned to their home recently, their 13-year-old dog named Chucky was completely wet. The couple assumed the dog had splashed around in his water bowl and made a mess in the house. When no evidence could be found inside, they turned to their security footage (录像).

What they saw made the blood freeze in their veins. Chucky was walking near their backyard swimming pool when he stumbled (绊倒) and fell in. Since the dog is so tiny, he was unable to get a purchase on the slick sides of the pool.   Instead, he paddled around, searching in vain for a way out. After a few desperate moments, the couple's other dog appeared on the scene. Jessie is a 7-year-old dog who became noticeably upset when she saw her friend struggling to keep his head above the water. She began circling the pool's edge, following Chucky as if she was encouraging him not to give up.

For 34 minutes, Jessie worked to rescue her friend. She repeatedly tried to grab hold of the smaller dog with her mouth, but Chucky kept slipping out of her grasp. Finally, after several failed attempts, Jessie succeeded in grasping Chucky's neck and dragging him out of the pool.

When Byron and Melissa realized Jessie was a hero, they were unspeakably grateful for their sweet girl! “We still struggle to watch that video today, just thinking of what could have happened if Jessie was not there,” Byron said. “I'm really proud of her, considering she is the youngest.” The family now plans to install a pool cover to keep their pets safe. Thankfully, they have a wonderful life-dog on duty just in case anything ever goes wrong!

7 . Benefits of Reading to a Dog

Here are five great reasons why your kid should read to a dog.

Dogs create a stress-free environment

It's hard to be really stressed(焦虑) around a cozy, friendly dog. Classrooms can be tense for kids who aren't great readers or presenters.     1    

Your kid won't even know she's building her vocabulary

    2    Without even knowing it, she'll be building her vocabulary, becoming more interested in books and improving her oral skills. Kids may also become more active to read aloud in other settings, as they get better at reading out loud to a dog.

A confidence-booster(增幅器)

Dogs are nonjudgmental. Kids will feel less self-conscious about reading aloud to them rather than, say, a judgmental human being.    3     .Thus they will be less afraid to read aloud in class.

Dogs like what your kid likes

Wanna talk about video games? Woof! Mermaids? Woof! A favourite cartoon? Woof! Dogs are interested in whatever your kid is interested in.

    4     They're not going to roll their eyes when your kid reads the Pokemon Go manual to them for the hundredth time. In fact, they'll just woof for more.

Petting a dog reduces stress and can even improve movement skills

Just grooming(梳毛)can help to improve a child's movement skills.

    5    Petting or hugging a dog also provides valuable breaks in reading, which gives children a chance to process what they've just read.

9 . When he was fourteen, his ambition was to run a pub, just like his dad.     1     With a chain of restaurants, a number of popular television series and best-selling cookery books, Jamie Oliver is a well-known name in every UK household. I'm a huge “Jamie fan”. I admire his passion for improving the food we eat and helping people change their lives.

    2     He took fifteen unemployed young people, with no previous experience of cooking, and trained them to be top-class chefs (厨师) in his restaurant, also called Fifteen. I remember one trainee, Lloyd Hayes. He left school with no qualifications and started getting into crime.     3     I think it's this kind of success story that makes Jamie and his projects so special.

Another special project is Jamie's Ministry of Food which he started in 2008. There are two aims: firstly, to teach people how to cook healthy, affordable food instead of eating fast food; secondly, to set up the Pass It On scheme: encouraging each person to pass on a recipe they learned to four other people.     4     Thousands of people have changed their cooking habits as a result — and I'm one of them. I've decided I'm not going to eat fast food anymore.

It's not only adults, but children, too. Jamie's School Dinners, one of Jamie's best-known projects, tried to improve food in schools and encourage children to eat well. It was difficult to convince some of the children, but in the end, many schools improved their menus.     5    

So, what's Jamie going to do next? Well, whatever it is, one thing is for sure, I'm not going to miss it!

10 . Fast walkers may live longer than dawdlers (缓慢的人)— regardless of their weight, a new study suggests.

Researchers at Leicester University analyzed data on 474, 919 people with an average age of 52 in the UK Biobank between 2006 and 2016. They found women who walked briskly had a life expectancy of 86.7 to 87.8 years old, and men who kept up the pace had a life expectancy of 85.2 to 86.8. Slow walkers hadn’t much encouraging prospects (前景): women had a life expectancy of 72.4, and men of 64.8 years old, if they were more leisurely in their movements. According to the paper, published last week, that ratio held true even if the fast walkers were severely overweight. It does not necessarily mean fast walkers will live longer. Experts say it suggests walking speed could be a simple way for doctors to judge their patients’ general health alongside other tests.

It is hardly the first study holding up walking speed as a powerful evidence that appears to improve and determine our health.

In 2011, the Journal of the American Medical Association (JAMA) published a study by Stephanie Studenski, who found the same: walking speed was a reliable predictor of life expectancy.

In 2013, US researchers found walking pace was linked to lower heart disease risk and longer life expectancy. In 2018, a study from the University of Sydney found picking up your walking pace to even an “average speed” could cut your risk of premature death by a fifth.

And Tom Yates, the physical activity professor at Leicester who's behind the latest study, has been publishing findings on this connection for years.

In 2017, he analyzed the same UK Biobank data and found walking speed appeared to affect the risk of dying from heart disease — concluding that the slowest walkers were twice as likely to suffer a heart-related death compared to quick walkers.