As global temperatures continue to rise, more “extreme rain” events—intense, cats-and-dogs down pours—can be expected, said the study, published Monday in the journal Nature Climate Change. And that, scientists said, means an increased flood risk, particularly for the world's driest areas. The study challenges the idea that global warming is causing dry areas to become drier and wet areas wetter.

    “In both wet and dry regions, we see these great increases in heavy precipitation（冰雹）,” lead author Markus Donat, a climate scientist at the University of New South Wales, told Nature.

    Donat and his team collected data from 1951 to 2010 on extreme precipitation events from 11, 000 weather stations around the world, Nature reported.

     In that time, the number of days with“extreme precipitation” increased 1 percent to 2 percent per decade.

  “We found a strong relationship between global warming and an increase in rainfall, particularly in areas outside of the tropics,” Donat said in a statement.

  “Importantly, this research suggests we will see these extreme rainfall events increases at regional levels in dry areas, not just as an average across the globe,” Donat added.

    Peter Stott, a senior climate scientistat Met Office, told Climate Central that the study's findings are important, because more violent rainfall and flooding will “challenge our capability toadapt to a rapidly changing climate.”

    As Nature reported, the researchaligns（结盟）with a 2015 study that found global warming has led to a sharp increase in record-breaking precipitation events. Donat told Nature that his study should come as a warning to world governments.

    A great woman once said, “Women must try to do things as men have tried. When they fail, their failure must be a challenge to others. “These are the words of US pilot Amelia Earhart（1897- 1937）, a pioneer in aviation（航空领域）, who was the first woman to fly across the Atlantic Ocean

    Her story ended in mystery when she disappeared without a trace（踪迹）during a flight over the Pacific Ocean. Theories about what happened to Earhart were proposed, but nothing was ever confirmed—until now. A study published in March conducted by Richard Jantz from the University of Tennessee, US, determined that bones found in 1940 on a remote Pacific island belonged to Earhart. Following the discovery, the world's memories of the legendary female pilot were brought back to life.

    Earhart was born in 1897. When she was young, she was very interested in stories about women who were successful in male-dominated（男性为主的）professions, such as engineering and law. But in 1920, Earhart's life changed after her first experience of being a plane passenger. As soon as the plane left the ground, Earhart knew that she loved flying, so she found herself a teacher and started to learn how to fly for herself. To pay for the lessons and buy a plane of her own, she took all sorts of jobs.

    In 1932, Earhart flew solo（独自地）across the Atlantic, becoming the first woman ever to do so. She also designed a flying suit for women and went on to design other clothes for women who led active lives. When she was nearly 40, Earhart was ready for a final challenge—to be the first woman to fly around the world. Her first attempt was unsuccessful but she tried again in 1937 with her navigator（领航员）Fred Noonan. But one month later, they disappeared in bad weather in mid-flight.

    Even though it's still not clear how she ended up on the island, we're one step closer to finding the answer. And no matter what, Earhart will be forever remembered as a brave pioneer, both as a pilot and as a woman.

    Solar energy systems/power plants do not produce air pollution, water pollution, or greenhouse gases. Using solar energy can have a positive, indirect effect on the environment, when solar energy replaces or reduces the use of other energy sources that have larger effects on the environment.

    However, some poisonous materials and chemicals are used to make the photovoltaic (光电池的) cells that convert sunlight into electricity. Some solar thermal (保热的) systems use potentially hazardous liquids to transfer heat. Leaks of these materials could be harmful to the environment. U. S. environmental laws regulate the use and settlement of these types of materials.

    As with any type of power plant, large solar power plants can affect the environment near their locations. The placement of the power plant may have long-term effects on the habitats of native plants and animals. Some solar power plant-s may require water for cleaning solar collectors and concentrators or for cooling turbine generators. Using large volumes of ground water or surface water in some dry locations may affect the ecosystems that depend on these water resources. In addition, the beam of concentrated sunlight a solar power tower creates can kill birds and insects that fly into the beam.

    The amount of solar energy that the earth receives each day is many times greater than the total amount of all energy that people consume each day. However, on the surface of the earth, solar energy is a variable and irregular energy source. The amount of sunlight and the intensity of sunlight varies by time of day and location. Weather and climate conditions affect the availability of sunlight daily and on a seasonal basis. The type and size of a solar energy collection and conversion system determines how much of the available solar energy we can convert into useful energy.

    "Make way, good people, make way, in the King's name! "cried he. "Open a text; and, I promise you, Mistress Prynne shall be set where man, woman, and child, may have a fair sight of her brave clothing, from this time till an hour past noon. A blessing on the moral Colony of the Massachusetts, where immorality is dragged out into the sunshine! Come along, Madam Hester, and show your scarlet （鲜红色的；罪孽深重的）letter in the market-place!

    A lane was at once opened through the crowd. Led by the beadle （狱吏），and attended by an irregular procession of serious-looking men and unkind-looking women, Hester Prynne set forth towards the place appointed for her punishment. A crowd of eager and curious schoolboys, understanding little of the matter in hand, except that it gave them a half-holiday, ran before her progress, turning their heads continually to stare into her face, and at the winking baby in her arms, and at the shameful letter on her breast.

    It was no great distance, in those days, from the prison-door to the market-place. Measured by the prisoner's experience, however, it might be considered to be a rather long journey; for, though her manner was proud, she perhaps underwent an extreme pain from every footstep of those who thronged to see her, as if her heart had been thrown into the street for them all to step upon. In our nature, however, there is a condition that the sufferer should never know the intensity of what he endures by its present suffering, but chiefly by the pain that rankles （使痛心）after it. With almost a calm manner, therefore, Hester Prynne passed through this portion of her suffering, and came to a sort of scaffold （刑台），at the western end of the market-place. It stood nearly beneath the eaves of Boston's earliest church, and appeared to be a fixture there.

    One of the most outspoken supporters that I know of women and girls is actually a man. As co­founder of the ONE Campaign, my friend Bono spends a lot of time speaking out against global poverty (贫困). Together, we're working to get out a simple, powerful message: poverty is sexist.

    Women and girls are more likely to be in poverty, less likely to get an education and more likely to suffer bad health. And when they are born into poverty, it is much more difficult for them to lift themselves and their families out of it.

    Why? One reason is that breaking out of poverty takes time­and that is a resource women around the world are short on. On average, women spend about twice as much time as men in doing the unpaid work that makes life possible for everyone, like cooking, washing, cleaning, shopping and caring. In developing countries, the gap is even much bigger. As a result, women have no time to finish their education, learn new skills, open a business, develop personal relationships or even go to the doctor. They dream of creating a better future for their children, but they can not spare the hours to put those dreams that they have into action.

    The fact that the potential of so many women and girls is going unrealized is a sad thing­but it is also an opportunity for us. We need to recognize, reduce and redistribute the burden of work that is holding them back. Because if women have time to invest (投资) in themselves and their ideas, they could transform the world.

Have you ever heard of invisible ink? You may have seen it in movies. When light is shone on the paper which invisible ink is written on, you can read it!

As magical as this seems, the change in color is due to science. The ink is absorbing higher energy light and giving lower energy light. This reaction is an example of fluorescence (荧光) .

Light is a very broad term that describes a range of electromagnetic rays, including gamma rays, infrared light (红外光) and ultraviolet light. One part of the electromagnetic visible light is the colors that we can see with the human eye. These rays travel in curvy lines and each type of the ray is characterized by a different wave pattern. For example, Gamma rays have a shorter wavelength than infrared light. Shorter wavelength is connected with higher energy, so gamma rays also have more energy than infrared light.

Corals (珊瑚) are animals that live underwater. And the corals in the Red Sea exhibit fluorescence. Why is this happening? Scientists have shown that fluorescent objects absorb higher energy light and release lower energy light. Since the corals of the Red Sea are deep in the water where there is very little visible light, scientists theorize that these corals absorb ultraviolet light and produce visible light. They have special photo proteins, which enable them to change invisible light to visible light.

Fluorescence is not just used to create pretty colors. Corals have developed photo proteins for a biological reason. The visible light is used by algae (海藻) , which are eaten by the coral, to make food through photosynthesis (光合作用). The visual character of these photo proteins could also be used for biomedical research. They can highlight cells and cell structures under a microscope.

Isn't it amazing that a simple organism that we don't think very much of is not only grand but could also have so many potential uses in medical research!