For nearly a century before there was such a thing as a space program, a view of space was possible. People could see full views of the Moon, explore Mars(探测火星),and study the outer space beauty. All of this was made possible by a small group of artist-astronomers(天文艺术家) who worked to show people how other worlds in space might look.

    Lucien Rudaux, a French artist, was the first to use his artistic ability and his knowledge of astronomy in art. His paintings show a mixture of skilled observations, brilliant imagination and careful attention. As a result, many of his works have come surprisingly close to actual conditions on distant planets. His painting of Mars included moonlike craters(火山口) that were first photographed by the astronauts in 1965. His 1930 painting of a dust storm looks remarkably like a photograph of a storm taken by the astronauts in 1976.

    The artist-astronomers, including Rudaux, made people interested in outer space by painting what turned out to be exact portraits of the planets.

    There's nothing like a good night's sleep — but what does that really mean? It turns out that the answer depends not only on your age, but also on your lifestyle. Some people are productive and happy with fewer hours of sleep, while others need more. Still, experts can determine guidelines that work for most people. The National Sleep Foundation researched the topic and gave new recommendations this week. The foundation acknowledges that sleep needs will vary — lifestyle and stress should be taken into consideration — but their recommendations offer a general guideline. For example, teenagers (14 —17 years old) need 8—10 hours, sleep every day.

    To create the recommendations, some sleep and medical experts reviewed 312 articles from journals published during the last decade. This is the first time that any professional organization has developed age-specific recommended sleep durations based on a systematic review of the world scientific literature.

    A lack of sleep can be linked to weight gain, because that causes an increase in appetite, according to the foundation. It can also have serious consequences on the brain. People who do not get enough sleep are at increased risk for depression, and can endanger others. Those that become sleepy while driving, for example, risk both their lives and the lives of those around them.

    Researchers also have found in the past that too much sleep can have negative effects. Low socioeconomic status and depression reportedly are significantly associated with longer sleep. However, experts nowadays find that research on oversleeping is still unconvincing and needs more attention. Currently, there is no strong evidence that sleeping too much has health consequences. There is, however, laboratory evidence that short sleep durations of four to five hours have negative consequences. We need similar laboratory studies to determine whether long sleep durations result in physiological changes that could lead to disease before we make any recommendations against sleep extension.

    If you travel, you will leave a carbon footprint in your wake. You can't help it. But eco-friendly travel practices can lighten the harm on Mother Earth. Green travel is not a passing trend but a lifestyle choice. {#blank#}1{#/blank#}.

    Choosing a green destination

    No destination is a Green Giant. {#blank#}2{#/blank#}. However, some countries and cities show a deep commitment to Earth-friendly policies and practices. When researching a vacation spot, look for places that naturally embrace the green lifestyle.

    Choosing green transportation

    What makes Mother Earth proud? Seeing you use your own power to get around. Many adventure tour operators arrange cycling, hiking and walking holidays. {#blank#}3{#/blank#}. The greenest rides typically run on electric power. Switzerland is taking the lead with its hybrid buses and trains powered by hydroelectricity; Japan is running close behind.

    Choosing a green hotel

    Once you are at your destination, if you can get the hotel right, you can make the greatest impact. {#blank#}4{#/blank#}. Look for a fact sheet online, or call the front desk. You can also search for hotels approved by respected certification programs, such as Green Key and the Global Sustainable Tourism Council.

    {#blank#}5{#/blank#}.

    The Earth-friendly choices are numerous: You can sail, bike, kayak, bike, swim, bird-watch and play I-spy-a-monkey in a tree. Visit a local food market, and don't forget to bring a reusable bag for purchases. You can also lend a hand during your holiday. The green movement has changed from how to preserve and protect to how to use less and do good when you're there.

A. Choosing green travel

B. Choosing green activities

C. Next in line are trains and buses

D. They all make environmental missteps

E. Most major chains operate in-house green program

F. If you plan to drive, consider a fuel-efficient vehicle

G. Follow the tips and watch your footprints turn greener

    Our world is more connected than ever before thanks to technology. {#blank#}1{#/blank#} Indeed, it is becoming increasingly important that we all learn how to deal with this painful feeling.

    You should be determined to actively end your loneliness. We often end up passively waiting for someone else to make us feel less lonely. You may feel that your loneliness indicates that nobody is willing to connect with you. And there is nothing you can do about it. But that is far from the truth. {#blank#}2{#/blank#}

    You should find reasons why you are lonely. We all feel lonely for different reasons. Some of us have no one to interact with on a consistent basis and that's why we feel lonely. You may feel that the people in your life don't share your thoughts and ideas. {#blank#}3{#/blank#} you need to identify it. And you know exactly how to handle your loneliness.

{#blank#}4{#/blank#} People who are lonely tend to fall into destructive mental habits. They try to avoid the pain of not being understood and being disconnected by not giving people an opportunity to understand and connect with them. So the solution is to share your thoughts and feelings with others and to do so openly and fearlessly.

    You should find people who share your interests. {#blank#}5{#/blank#} everybody is interested in something. And just as there are many interests, there are many people who share those interests. Find what interests you and connect with others on that basis.

A. Whatever the reason is,

B. When you feel really lonely,

C. If you want to make friends with them,

D. Whether it's coin collecting or video games,

E. You should be open about your thoughts, ideas and desires.

F. Ending loneliness is something that you can and should pursue actively.

G. However, more and more of us find ourselves having to stand loneliness.

    People have grown taller over the last century, with South Korean women shooting up by more than 20cm on average, and Iranian men gaining 16.5cm. A global study looked at the average height of 18-year-olds in 200 countries between 1914 and 2014.

    The results show that while Swedes were the tallest people in the world in 1914, Dutch men have risen from 12th place to claim top spot with an average height of 182.5cm. Latvian women, meanwhile, rose from 28th place in 1914 to become the tallest in the world a century later, with an average height of 169.8cm.

    James Bentham, a co-author of the research from Imperial College, London, says the global trend is likely to be due to improvements in nutrition and healthcare. "An individual's genetics has a big influence on their height, but once you average over whole populations, genetics plays a less key role," he added.

    A little extra height brings a number of advantages, says Elio Riboli of Imperial College. "Being taller is associated with longer life expectancy," he said. "This is largely due to a lower risk of dying of cardiovascular(心血管的)disease among taller people."

    But while height has increased around the world, the trend in many African countries causes concern, says Riboli. While height increased in Uganda and Niger during the early 20th century, the trend has reversed in recent years, with height decreasing among 18-year-olds.

    "One reason for these decreases in height is the economic situation in the 1980s,"said Alexander Moradi of the University of Sussex. The nutritional and health crises that followed the policy of structural adjustment, he says, led to many children and teenagers failing to reach their full potential(潜力)in terms of height.

    Bentham believes the global trend of increasing height has important implications "How tall we are now is strongly influenced by the environment we grew up in," he said. "If we give children the best possible start in life now, they will be healthier and more productive for decades to come."

Bruce, a parrot missing part of his beak （喙）,  creatively uses stones to clean feathers （羽毛）,  highlighting advanced intelligence in parrots. 

Bruce lost the upper part of his beak in 2012 and was sent to live at a reserve in New Zealand. The defect made Bruce unable to search for food on his own, let alone keep his feathers clean with his beak. But in 2021, when comparative psychologist Bastos arrived at the reserve with colleagues to study parrots, zookeepers reported something strange：Bruce had seemingly figured out how to select and use small stones to clean his own feathers with his beak. 

Over nine days, the team kept a close eye on Bruce, quickly taking, videos if he started cleaning his feathers. It turned out that Bruce had indeed invented his own way to do so, the researchers reported in Scientific Reports. 

"It's crazy because the behavior was not from the wild, " Bastos says. When Bruce arrived at the reserve, he was too young to learn how to clean his feathers. And no other bird in the reserve uses stones in this way. "It seems like he just invented this tool use for himself, " she says. 

Tool use is just one of parrots' many talents. They're famous for copying and even understanding human speech. Some species can also solve complex puzzles, like how to enter a covered rubbish bin or practice self-control. 

For a concept as abstract （抽象的） as intelligence, it's challenging to develop a definition that applies across animals. Researchers often point to features once thought to make humans special—enhanced learning, memory, attention and movement control—as signs of advanced skills. However, many of these abilities can also be seen in parrots, as well as other animals like chimpanzees, dolphins and elephants. 

"Parrots are our evolutionary （进化的） mirror image. These brilliant birds may teach us about how humanlike intelligence can appear, " behavioral ecologist Antone wrote in his 2022 book The Parrot in the Mirror. With powerful brains and a preference for words, these birds are "the very best example, " he writes,  "of nature's 'other try' at humanlike intelligence. "