Scientists have found living organisms trapped in crystals(晶体) that could be 50,000 years old.

     The organisms were found in a hot, but beautiful cave system in Naica, Mexico. These ancient life forms can be seen only with a microscope. Penelope Boston, who leads the Astrobiology Institute at NASA, the space agency of the United States, says the ancient microbes(微生物) were able to live by eating minerals such as iron.

     She spoke about the discovery recently at a meeting of the American Association for the Advancement of Science. If the findings are confirmed, they will show how microbes can survive in extreme conditions. Forty different kinds of microbes and some viruses were found in the underground area. The genetic structures of these organisms are 10 percent different from those of their nearest relatives.

     The caves in Naica are 800 kilometers deep. They were once used for mining lead. Before the miners began working in the caves, the area was separated from the surface and the outside world. Some of the caves are as big as the large religious centers built during Europe's Middle Ages. There are crystals covering the walls. The caves are so hot that scientists must wear special clothing to keep cool. The clothing keeps the crystals safe from human germs（病菌）or other damage. Boston said the researchers could only work for about 20 minutes at a time before they had to go to a room that was 38 degrees Celsius to cool down.

     NASA officials would not let Boston share her findings with scientific experts before last week's announcement. So scientists could not say much about the findings. But Norine Noonan, a biologist with the University of South Florida, said she believed them. "Why are we surprised?" Noonan asked. "As a biologist, I would say life on Earth is extremely tough and extremely colorful."

     Boston is also studying microbes commonly found inside caves in other countries, such as Ukraine and the United States. These microbes appear to be impossible to kill. Boston said they show how difficult life on Earth can be.

    Scientists are using robots to study the health of waters in and around Venice, Italy. The robots are designed to act like fish, other underwater creatures and plants. The scientists are working with several universities and research centers as part of a group called subCULTron. The European Union gives money to the project as part of its Horizon 2020 program whose aim is to take great ideas from the lab to the market and support science and innovation (创新) in Europe. The scientists want to use the artificial intelligence of the robots to help humans understand what is happening under the water of the Venice lagoon (潟湖).

    SubCULTron, a collective artificial intelligence project, plans to create the biggest shoal (鱼群) of robot fish in the world. The project's aim is to improve knowledge of the seabed and try to turn human abilities into hi-tech items.

    Alexandre Campo, a computer scientist, says the scientists have looked at the way animals learn to work in groups to understand how robots can learn to work together. The subCULTron project wants its robots to learn to work together so they can watch out for changes and new problems in the water.

    One problem the researchers had in the beginning was how the robots would communicate with each other. Wi-Fi and GPS equipment don't work underwater. Instead，the robots can use sonar (声呐) and an electric field.

    Another problem was charging batteries. The robots come up to the water's surface and stay near a boat or a power station to charge without any electrical cables. Besides, how to be water- proof, especially for some key pads of the robots, was really tough. Fortunately, a special mixture has been created to be pinned on the robot, which successfully stands the test of water.

    The health state of the lagoon is pretty good. There are no industrial polluters, and the city now has a modem sewer (污水管) system. It's not like before when all the waste flushed directly into the water. The robots in Venice will continue their work until 2019. The subCULTron project hopes they develop into “an artificial society underneath the water surface” that serves “a human society above the water”.

    Last night's meteor(流星) shower left many people in Emerald Valley dissatisfied. They gathered in the suburbs of the city with heavy telescopes，expecting to watch the brightly burning meteors passing through the sky. However, what they found was a sky so brightened by the city's lights that it darkened the light of the meteors passing overhead.

    “My family was so frustrated，” admitted town resident Duane Cosby, “We wanted to make this an unforgettable family outing，but it turned out to be a huge disappointment.”

    Astronomers—scientists who study stars and planets—have been complaining about this problem for many years. They say that light pollution prevents them from seeing objects in the sky that they could see quite easily in the past. They call on people and the government to take measures to fight against it.

    Besides professional and amateur(业余的) star observers, there is yet a population that suffers even more from light pollution. This population consists of birds，bats, frogs, and snakes etc. For example, outdoor lighting severely affects migrating(迁徙的)birds. According to the International Dark­Sky Association, “100 million birds a year throughout North America die in crashes with lighted buildings and towers. ”

    Countless animals injuries and deaths result from the use of artificial lighting. Clearly, people enjoy the benefits of lighting their evenings, but some scientists think it can be harmful to humans, too. They worry that exposure to light while sleeping can increase people's chances of getting cancer.

    Emerald Valley is only one community that is becoming aware of the negative effects of light pollution. For years, Flagstaff, Arizona has enforced lighting rules in its city in order to help astronomers with their observations. Similar efforts have been made worldwide, and a movement is underway to remind us to turn off lights when we are not using them, so that other creatures can share the night.

    About three decades ago, China was known as the “Bicycle Kingdom”. But later on, bikes were replaced by their fuel-powered competitors.

    But recent months have seen a recovery of the humble bike across China, with an increasing number of people choosing cycling instead of driving to schools, to workplaces or to do sightseeing. The introduction of bike-sharing schemes, pioneered by start-ups like Ofo and Mobike, has brought the trend to a new level.

    People can unlock the shared bikes by simply using their smart phone. The bikes are equipped with GPS and can be left anywhere in public for the next user. They're popular among many Chinese people as they provide an effective solution to the “last mile” problem, which refers to the final leg of a person's journey.

    “In places where the subway doesn't extend, where it's difficult to change from one kind of transport to another, it's so easy to get where you want to go with Mobike,” Hu Hong. 29, told AFP. She pedals（骑车）to her Shanghai real-estate job.

    However, the schemes have also led to problems such as illegal parking, vandalism（故意毁坏）and theft. Last month, two nurses in Beijing were placed under administrative punishment for five days for putting locks on two shared bikes. And in December, a man who stole a shared bike was sentenced to a 3-month detention（拘留）, and fined 1,000 yuan by the Shanghai Minhang People's Court.

    “Bike-sharing is a greener method of transportation and provides a user-friendly experience.” said Liu Xiaoming, vice-minister of transport.

    “But it's a combination of online and offline business. Operators are usually strong in online services, but lack offline business experience, which causes problems.”

When you think about art, you might consider it to be permanent. After all, that picture you drew in kindergarten might still hang on your refrigerator years later. {#blank#}1{#/blank#} Think about a Broadway performance. When it's over, it's over. Sure, it might live in your memory. But the live show is a special event. It is limited to a certain time and place. 

Can you think of other forms of art that are temporary? If you're a fan of the beach, sandcastles might come to your mind. Have you ever spent hours building a beautiful sandcastle? {#blank#}2{#/blank#} You knew your work of art would be gone as soon as the tide came in. The sandy beach is a canvas where nature erases "paintings" daily. 

Most of the time, art made from sand can't last long. Still, many people love using sand to create their own unique vision of beauty. One of the most attractive types of sand art is sand animation. {#blank#}3{#/blank#} Artists who work in sand animation use sand to make a set of images that usually tell a story. They often start with a large amount of sand on a flat surface, such as a table. They then use their hands and fingers to draw in the sand. 

{#blank#}4{#/blank#} However, the wide variety of beautiful and highly-detailed sand artworks might surprise you. Many of these works or art are temporary. That's where the animation part comes in. 

Sand animation artists create a series of images that move to tell a story. They might also use music and special lighting to complete the effect. Sometimes they photograph or video their creation throughout the process. {#blank#}5{#/blank#}.

A. It is a type of live performance art. 

B. Not all works of art are permanent, though. 

C. Sand animation is beautiful but lasts only for the moment. 

D. Then, they turn it into a sand animation movie when it's finished. 

E. It might seem like using sand would limit the art you could make. 

F. If you have, you would probably be sad when it was time to leave the beach. 

G. Building a sand castle is a family-friendly activity perfect for large groups. 

Do you need a career launch plan? It isn't absolutely essential but it can be extremely helpful! A well-created plan is not just about landing a job; it is about entering the professional field with a competitive edge. Beyond that, it's a strategy. {#blank#}1{#/blank#} Therefore, a career launch plan is your survival guide, helping you avoid the traps and seize the right opportunities. So why not follow the following tips to create a right career launch plan?

{#blank#}2{#/blank#} If you were to plan out your travel routes, what would you do? You're not just randomly moving; you're intentional about where you want to go and what you want to achieve. So is a career plan. It involves outlining specific and achievable goals that give direction to your career trajectory （轨迹）.

Develop relevant skills. Once you've identified the qualifications and skills demanded in your ideal profession, it's time to acquire them! Sign up for courses, pursue certifications, or gain hands-on experience to enhance your skill set. {#blank#}3{#/blank#}.

Start your job hunt. Your approach to job applications should be more like a precision strike than a messy explosion of arrows in all directions. {#blank#}4{#/blank#} It's not just about quantity; it's about quality. Tailor each application to the specific role and company, emphasizing how your skills and experiences agree with their needs.

Stay flexible and agile （机敏的）. The job market is changing, and being adaptable is an invaluable ability. {#blank#}5{#/blank#} Develop a mindset of continuous improvement—always seeking ways to enhance your skills, knowledge, and approach to stay relevant in the ever-evolving professional landscape.

A.Set your goals.

B.Research your options.

C.So, what should you do to deal with it?

D.To achieve this, develop a systematic approach to your job search.

E.By doing these, you're essentially improving your techniques!

F.The job market can be a jungle, especially when you're just starting.

G.The goal is to create a foundation that'll guide your career decisions.