Climbers at Qomolangma are being asked to clean up after themselves.

Qomolangma has earned the nickname（绰号）the World's Highest Garbage Dump（垃圾场）.

    Climbing Qomolangma,the world's highest mountain,just becomes more challenging.The government of Nepal is telling climbers they cannot leave trash on the trails.Each climber will have to come down the mountain with at the least 18 pounds of garbage.That's the average amount of trash a climber leaves behind on Qomolangma.

    Officials say climbers are responsible for their own trash.“We are not asking climbers to pick up trash left by someone else,”said the Nepal Tourism Ministry.“We just want them to bring back what they took up.”

    More than 4,000 people have reached the 29,035-foot summit（顶峰）in more than 60 years.Leaving trash along the way helps climbers keep their bags light so they have energy to reach the summit.“The trash problem in Qomolangma is not new.”Burlakoti says.“When the people started to climb the mountain,they started to leave their garbage there.”They have left behind bottles,food boxes and equipment.

    The new rule came into effect in April,2014.To make sure it is followed,climbers will have to deposit money（交保证金）before they climb.Once they climb back down the mountain,officials will check climbers at a return camp to make sure they have the required 18 pounds of trash.If they do,their money will be returned to them.If they do not,climbers will not receive their deposit and they will not be given a permit the next time they want to climb Qomolangma.

    The goal is to make sure no more litter will be left on Qomolangma."As we offer Qomolangma to all the people of the world they should take responsibility to clean it."Burlakoti says,“After seeing the results from this,we will also apply this rule to other mountains.”

    One night, Pilar was in a deep sleep when she was woken by her cat Inti. Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door. When Pilar opened her eyes, she saw that her bedroom was filled with smoke. As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen. Pilar could easily have lost her life, but Inti would not let that happen. Even though Inti could have escaped the house through a cat door, he wouldn't leave Pilar.

    As amazing as this story is, it is not as uncommon as you may think. Take the example of Charlotte Lee and her horse, Thunder. One summer night, the whole family was asleep with the windows open. It was normally very quiet where they lived. Suddenly, there was a loud noise. Charlotte woke up from her sweet dream, and the noise continued. Then she heard a horse running fast towards the house. The next thing she saw was Thunder standing outside her window, neighing(嘶叫) and shaking his head. She knew something was wrong. Charlotte quickly got everyone out of the house before the earthquake hit. Thunder has saved her life.

    There are also stories of wild animals coming to the rescue of humans. One animal known to be a friend of humans is the dolphin. Once, Todd Endris was surfing with his friends when he was attacked by a 13-foot(4-meter) shark. In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Endris until he could get safely to shore. Without the help of the dolphins, there is little chance that Todd could have escaped.

    No one is sure why animals have so often come to our rescue. However, it is clear that humans and animals enjoy a close relationship. It is important that we care for them as much as we can.

    Drug companies have spent billions of dollars searching for therapies to reverse or significantly slow Alzheimer's disease, but in vain. Some researchers argue that the best way to make progress is to create better animal models for research, and several teams are now developing mice that more closely imitate how the disease destroys people's brains.

    The US National Institutes of Health (NIH), the UK Dementia Research Institute and Jackson Laboratory (JAX) - one of the world's biggest suppliers of lab mice - are among the groups trying to genetically design more suitable mice. Scientists are also exploring the complex web of mutations(突变) that influences neurological (神经学的) decline in mice and people.

    "We appreciate that the models we had were insufficient. I think it's sort of at a critical moment right now." says Bruce Lamb, a neuro-scientist at Indiana University ~ho directs the NIH-funded programme.

    Alzheimer's is marked by cognitive impairment(认知损伤) and the build-up of amyloid-protein plaques (淀粉样蛋白块) in the brains of people, but the disease does not occur naturally in mice. Scientists get around this by studying mice that have been genetically modified to produce high levels of human amyloid protein. These mice develop plaques in their brains, but they still do not display the memory problems seen in people.

    Many experimental drugs that have successfully removed plaques from mouse brains have not lessened the symptoms of Alzheimer's disease in people. One focused stumble came last month, when three companies reported that their Alzheimer's drugs had failed in large, late-stage clinical trials. Although the drugs successfully blocked the accumulation of amyloid protein in mice, they seemed to worsen cognitive decline and brain shrinkage in people.

    The drive for better mouse models comes as genomics studies are linking the most common form of Alzheimer's to dozens of different genes. This diversity suggests that each case of the disease is caused by a different combination of genetic and environmental factors. "There is no single Alzheimer's disease," says Gareth Howell, a neuro-scientist at Jackson Laboratory (JAX) in Bar Harbor, Maine.

    Howell argues that scientists' reliance on lab mice with only a few genetically engineered mutations might have limited research. His own work suggests that in mice, just as in people, genetic diversity plays a part in determining how Alzheimer's develops.

    The Winter Olympics is also called the White Olympics. At this time, many colorful stamps are published to mark the great Games. The first stamps marking the opening came out on January 25, 1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule.

    During the 4th Winter Olympic Games a group of stamps were published in Germany in November 1936. The five rings of Olympics were drawn on the front of the sportswear. It was the first time that the rings appeared on the stamps of the White Olympics.

    In the 1950's, the stamps of this kind became more colorful. When the White Olympics came, the host countries (东道国) as well as the non-host countries published stamps to mark those games.

    China also published four stamps in February 1980, when the Chinese sports men began to take part in the White Olympics. Japan is the only Asian country that has ever held the White Olympics. Altogether 14, 500 million stamps were sold to raise money for this sports meet. Different kinds of sports were drawn on these small stamps. People can enjoy the beauty of the wonderful movements of some sportsmen.

    Becca was 6 when she was told she had cancer on Sept. 8, 2014. She clearly remembers the bad days of her 26 months of non­stop treatment. Luckily, Becca celebrated her final treatment on Nov. 13, 2016, and she has been cancer­free ever since. But she was thinking about what her life was like while experiencing treatment.

    I was never able to do much, and that's what the kids lying in their hospital beds right now experience, asking their mom and dad, "When are we leaving? When can I play with my friends？" So I decided I have to help them.

    In February, 2017 Becca came up with the idea for Knots and Arrows, a company that makes bracelets (手镯) out of swimsuit materials (泳衣布料). Part of the money made from each bracelet goes to the organizations that help people with cancer.

    Becca created the company with her father, Gerhard Salmins. Gerhard Salmins once had cancer and already recovered from it. "I would be in the hospital sitting there crying and then my dad would come in and he would play games with me，" she said. "It made me forget about what I was going through." Becca said the name of the organization shows the motto (座右铭) she stuck to through her personal cancer journey.

    Her organization has already given thousands of dollars to research organizations and families in need. Becca said she hopes her bracelets will make people remember that great things can result from small changes. "No matter what age you are, what you look like, how you act, you can make a difference!" she said.

    For the past few months, my three-year-old daughter has spent an hour every week learning a foreign language. She walks into a small room in a local school, where she and a handful of three and four-year-old spend the next hour dancing to ^“La Vaca Lola”, a song about a Spanish cow, creating finger puppets(木偶) to voice what they like and don't like (me gusta, no me gusta) and shouting out which animals are big (grande) or small (pequeno).

    She tells us little about the classes. In fact, for the first few weeks, nothing at all. I begin to wonder if it was a huge mistake (each lesson works out at about £9) but then I show her “La Vaca Lola” on YouTube. She shouts vaca with enthusiasm and with what I hope is a Spanish accent.

    The wish to enroll(使……加入) her in language lessons came, like most things, gradually and then in a sudden rush. In my day job, I read and edit stories about the Chinese economy. For a long time, I felt that it would be good for her to learn another language but I had no great plan as to when.

    Then I read Edward Luce's The Retreat of Western Liberalism and all my thoughts and worry about the economy combined into a panic. Waking in a sweat, it seemed obvious that if my daughter was to have any kind of future, she would have to learn another language. Ideally (理想地) immediately.

    I thought about Mandarin Chinese, one of the top 10 languages most important for our future, according to the British Council (others include Arabic, French, German, Portuguese, Italian, Russian, Dutch and Japanese). But there were no classes for young children nearby. There were, however, local Spanish classes—the number-one language on the list. When she started to sing "Incy Wincy Spider" in Spanish and English—helped by a Spanish nursery worker-our decision was made.