A new study warns that about thirty percent of the world's people may not have enough water by the year 2025.

    A private American organization called Population Action International did the new study. It says more than 335 million people lack enough water now. The people live in 28 countries. Most of the countries are in Africa or the Middle East.

    P-A-I researcher Robert Engelman says by the year 2025, about 3,000 million people may lack water. At least 18 more countries are expected to have severe water problems. The demand for water keeps increasing. Yet the amount of water on the earth stays the same.

    Mr. Engelman says the population in countries that lack water is growing faster than in other parts of the world. He says population growth in these countries will continue to increase.

    The report says lack of water in the future may result in several problems. It may increase health problems. Lack of water often means drinking water is not safe. Mr Engelman says there are problems all over the world because of diseases, such as cholera, which are carried in water. Lack of water may also result in more international conflict. Countries may have to compete for water in the future. Some countries now get sixty percent of their fresh water from other countries. This is true of Egypt, the Netherlands, Cambodia, Syria, Sudan, and Iraq. And the report says lack of water would affect the ability of developing to improve their economies. This is because new industries often need a large amount of water when they are beginning.

    The Population Action International study gives several solutions to the water problem. One way, it says, is to find ways to use water for more than one purpose. Another way is to teach people to be careful not to waste water. A third way is to use less water of agriculture.

    The report also says long-term solutions to the water problem must include controls on population growth. It says countries cannot provide clean water unless they slow population growth by limiting the number of children people have.

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    A new study suggests climate conditions in the Sahara Desert, one of hottest, driest and most deserted areas in the world, have changed from wet to dry a about every 20,000 years.

    But previous evidence has suggested the Sahara did not always experience such extreme heat and dry conditions. At times, the Sahara Ranged to a very wet climate. This permitted plants and animals to develop and grow and led to the creation of human settlements. Now, they have discovered more evidence, which, the lead researcher David Mc Gee says, supports the idea that the Sahara's climate kept changing between wet and dry about every 20,000, years.

    McGee reported these climate changes were mainly driven by changes in the Earth's(地轴)as the planet travels round the sun .This process affects the amount of sunlight between seasons. Every 20,000 years the Earth receives more strong summer sunlight. When the Earth's axis changes again, the amount of sunlight is reduced. This season change happened continuously every 20,000 years. The other part of the season produced rainy conditions, resulting in a wetter, greener, plant-rich environment. When the rainy activity weakens, the climate becomes hot and dry, like the Sahara remains today.

    The scientists based their research on dust collected from ocean sediment(沉积物)in the Atlantic Ocean bottom off the coast of West Africa. The dust contained layers (层)of ancient sediment built up over millions of years. Each layer could contain traces of Saharan dust as well as the remains of life forms. This information was used to assess over what time period the dust had built up. This led to the overall finding that the Saharan changes from wet to dry climates happened every 20,000 years.

David McGee said that today we only see the Sahara Desert as an extremely deserted and "inhospitable" place. The new study suggests that the area's climate has changes between grasslands and a much wetter environment, and back to dry climates, even over the last quarter million years. McGee says he thinks the latest research can be valuable in studying the Sahara's history as it relates to human settlement.

    Donna Strickland is a professor in the Department of Physics and Astronomy. Professor Strickland is one of the recipients(受领者) of the Nobel Prize in Physics 2018 with Gérard Mourou, her PhD supervisor at the time. They published this Nobel-winning research in 1985 when Strickland was a PhD student at the University of Rochester in New York state. Together they paved the way toward the most intense laser pulses ever created.

    Professor Donna Strickland is only the third woman ever to have won a Nobel Prize in physics. She and her fellow winners were honored for what the Nobel Committee called ground-breaking inventions in laser physics. Professor Strickland devised a way to use lasers as very precise drilling or cutting tools. Millions of eye operations are performed every year with these sharpest of laser beams.

    "How surprising do you think it is that you're the third woman to win this prize?"

"Well, that is surprising, isn't it? I think that's the story of Maria that people want to talk about — that why should it take 60 years? There are so many women out there doing fantastic research, so why does it take so long to get recognized?"

    Physics still has one of the largest gender gaps in science. One recent study concluded that at the current rates it would be more than two centuries until there were equal numbers of senior male and female researchers in the field.

    The last woman to win a physics Nobel was German-born Maria Goeppert-Mayer for her discoveries about the nuclei of atoms. Before that it was Marie Curie, who shared the 1903 prize with her husband, Pierre. This year's winners hope that breaking this half century hiatus will mean the focus in future will be on the research, rather than the gender of the researcher.

    Feel nervous on the first day of school? You are not alone! Here is some advice on how to make you feel comfortable.

    Get ready the night before. Plan out what you're going to wear and what you will need for class. Then get a nice, long sleep. There's nothing worse than looking terrible on the first day of school. If you don't want to oversleep, set an alarm on your phone, or alarm clock to wake you up on time.

    Eat a good breakfast. You'd be surprised at how much happier and more focused you'll be after eating a good breakfast. Have a healthy breakfast. A rich breakfast may make you feel lazy and sugar rich foods may affect your ability to stay focused.

    Decide whether to take the bus, walk, or have a ride from your parents. It's your call. If you want something familiar, take a bus ride and sit next to someone you already know. However, if you are really nervous, you can ask your mom or dad to drive you to school, but expect that there will be heavy traffic.

    Smile and be friendly! You want to seem easy to get along with and that you had the best summer. Smile and be friendly. Instead of coming up as a boring person, compliment people. Everyone needs a little confidence and is happy when praised on the first day of school.

Journalists are the major group of people who make their living from writing. Many young people who see themselves as future novelists choose journalism as a way of earning a living while developing their writing skills. Although writing for newspapers and writing for books require different qualities, the aspiration (志向) to be a great writer is not one to be discouraged in a would-be journalist.

Most people want their work to be recognized by others. This helps to give it value. Some people also want themselves to be recognized, so that they have status (地位) in the eyes of society. It is not a bad motive to wish to be famous, but this must never become your main reason for being a journalist. You will not be a good journalist if you care more for impressing your audience than for serving their needs.

Knowing the power of the printed or spoken word or image, some people enter journalism for the power it will give them to influence people. There is a strong belief that journalists control the mass media but the best journalists recognize their role as servants of the people. There is a difference between the desire to influence events for your own sake, and the desire to do it for other people. You should never use journalism for selfish ends, but you can use it to improve the life of other people.

Curiosity is a natural part of most people's characters and an important ingredient for any journalist. Lots of young men and women enter the profession with the desire to know more about the world without needing to specialize in limited fields of study. Most journalists tend to know a little bit about a lot of things, rather than a lot about one subject. Knowledge has many uses. It can simply help to make you a fuller and more interesting person. It can also give you power over people, especially people who do not have that particular knowledge. Always bear in mind that power can be used in a positive way to improve people's lives.