1 . Stephen Warren, study leader at the University of Washington — has been on the case of the green icebergs for more than 30 years. He first took samples from one of these green hunks of ice in 1988, near the Amery Ice Shelf, East Antarctic. Most glacial ice occurs in shades of white to brilliant blue. The bluer the ice, the older it is. Typically, compression (压缩) from accumulating layers of snow pushes air bubbles out of the ice, reducing the scattering of white light. The compressed ice absorbs most of the light except for blue — creating the blue color seen in the hearts of icebergs and glaciers.

The green ice was similarly bubble-free, and yet it looked green instead of blue. Warren and his team soon found that the green ice came not from glaciers, but from marine ice. That’s the ice from the undersides of floating ice shelves.

At first, the team thought that organic material in the marine ice was causing the green color. But further research showed that the green marine ice didn’t have a higher-than-usual amount of organic impurities. Now, a new study finds that a different sort of impurity may be the root cause of the green ice. Warren and his colleagues report that the marine ice at the bottom of the Amery Ice Shell has 500 times more iron than the glacial ice above.

This iron comes from the rocks under the Antarctic Ice Sheet, which are turned into fine powder as glaciers move over them. The icebound iron oxidizes (氧化) as it contacts seawater. The resulting iron oxide particles take on a green color when light scatters through them. When icebergs break off the larger ice shelf, they carry this iron-rich ice with them. It’s like taking a package to the post office. The iceberg can deliver this iron into the ocean far away, and then melt and deliver it to other living things that can use it as a nutrient.

2 . Can you survive an unannounced storm? Although there is expert broadcasting and we have cell phones, there are still some instances (情况) when the violent weather takes us by surprise.

While most Atlantic hurricanes form off the roust of Africa giving plenty of early warning, sudden Caribbean and Gulf of Mexico hurricanes form and move rapidly in less than a day’s time, endangering everyone and everything in their path.

Oil workers were trapped off the shore (海岸) when sudden storms appeared. Natural scientists have been stuck in coastal areas without storm warning. Ten years ago a Texas National Guard group was trapped on the beach by rain-forced flooding and bad to ride out (经受得住) a major hurricane during a training exercise. There’ve been a few instances when travelers were trapped on an island or in a coastal area and unable to escape in time.

Escaping from the storm-threatens areas is generally a choice for most of us — but not for all. Each year thousands of islanders across the Caribbean face the danger of hurricanes without so much as a public shelter to hide in. Most ride out the storm in their homes.

But there’re a few things yon ran do to prepare yourself for some unexpected emergencies. Being prepared for the unexpected may be your best and only defense. If you’re headed outdoors for a few days or weeks, you should always carry a flashlight with extra batteries, a Beidou device, and a basic medical box. If you’re traveling in your ear, remember you may suffer high winds. You’d better not stay inside to avoid being blown away along with your car. Keeping your head and your courage up is essential (必要的) to survival in any type of danger. Let common sense guide you and always be prepared for the worst.

7 . One of the greatest challenges in caring for such intelligent animals as chimpanzees(猩猩) is providing them with enriching experiences. Every day, the chimpanzees at Project Chimps receive morning and evening food-based enrichment devices, but caregivers are always looking for more ways to keep the chimps mentally engaged. With 79 chimpanzees, each with their distinctive personality, care staff often find that different chimps react differently to new enrichment.

Last year, we began inviting musicians to perform for chimps to see what they may respond. A violin performance received quite the response. Additional musicians were lined up to visit but the coronavirus has stopped the activities, which we hope to resume in the near future.

This past week, we brought an electric piano for the chimps to investigate. Some chimps, like twins Buttercup and Clarisse, were immediately interested and could not wait to tap out a few notes. Others, like Emma, were more interested in trying to take it apart.

29-year-old Precious has very little tolerance for the piano. She sat off to the side for a few minutes, but eventually she decided enough was enough. She called an end to the enrichment session by throwing a handful of waste at the piano. Receiving her message loud and clear, we removed the piano.

We could never have guessed how 33-year-old Luke would react to it. As with many retired lab chimpanzees, Luke has some anxiety issues. He seems particularly distrustful of anything new, including people, food, and enrichment. But when we presented the chimps with the piano, Luke was the first to investigate. We could not believe our eyes—this usually anxious chimpanzee bravely chose to explore something new!

To us at Project Chimps, this is what it is all about: giving chimpanzees the freedom to choose. We are honored to be part of their journey.

8 . Vietnam aims to solve the relations between economic development and cultural preservation. Vietnamese cultural departments and activists have tried to preserve the historical and cultural relics in the country.

Vietnam now has more than 40,000 historical relics. These relics of various forms and history are treasures for future generations.

However, hundreds of relics are severely damaged due to the negative influence of time, war and human activities. Head of Hanoi Relics Management Board, Nguyen Doan Tuan, says rescue work must preserve the relics' soul: "We cannot replace ruined construction with new materials. We must preserve its shape, size and style. We need to pay attention to every brick replaced so that it looks exactly like the original."

Most relics have to rely on tourist fee for repair and rescue work. Director of Van Mieu Cultural and Science Center, Dang Kim Ngoc, says that the relics must be promoted widely to attract more visitors and bring in more income for repair and preservation: "We provide constant guide services for visitors so that they understand more about our relics. At the same time, a natural surroundings of the relic has been ensured, including the grass field and garden to improve its scenic value "

The local government agreed that the relics must be turned to the community for shared efforts in the preservation work. Director of Vietnam Revolution Museum DangQuoc Quan, said that the community must be guided in the preservation and protection, "The UNESCO aims to let local community take part in the preservation of relics. We have seen limitations in the preservation of relics, especially festival related groups of buildings. This requires management and guidance by the government.”

Nguyen ThiMinh Ly from the Department of Heritage says the community should be guided in proper behaviors towards relics: "This will ensure the protection of cultural relics in later generations. Creative restoration（修复）must be based on previous values.”

Experts have called for a systematic（系统的）guidance by the state in local level preservation while promoting creative thinking in restoration for each relic.

Our school lies at the foot of a mountain with a small river passes by. It used to be a quiet, clean or beautiful place. It is a pity that things have changed since a chemical factory built near our school one year ago. Every one day the factory produces many waste water and some other solid waste things. The terribly pollution is harmful by our health. What's worse, the great noise from the factory had a bad effect on us activities. As a result, our school is no longer that it used to be. Our teachers and students are painful beyond expression.

10 . Many years ago, dogs and wolves were the same. But about 14,000 years ago, some wolves began to change. They were no longer as wild. No one knows exactly how this happened. Angus Phillips of National Geographic Magazine thinks it may have happened like this: “Some wolves moved close to human cooking fires after smelling something good to eat. Then they worked to get closer to groups of humans. They did this by being helpful or proving they would not hurt people. The humans might have used the wolves’ better hunting skills to help them hunt animals. The wolves could warn humans of danger at night. Over thousands of years, humans kept the large, rough wolves out of the human camps. This led to the development of different kinds of dogs that were more friendly to people. They began to look different than wolves. They were generally smaller than wolves, with a shorter nose.”

Through the late 19th century, humans would raise dogs for special skills they wanted, such as hunting, helping with the work on farms or protecting animals. Today, the most common use of a dog is for friendship. Some people even consider their dog to be a part of their family. Scientists are finding that dogs can even understand human emotions. Around the world today there are more than 400 million dogs. But their relationship with people is not always close. Some of these dogs become strays. They live on the streets and often eat garbage. Diana Bharucha, from Bangalore,

Diana, started a program called ‘Stray Dogs Free Bangalore.’ She says that dogs should have a home with a human master. Diana told the news-magazine Citizens Matters: “If the dog population continues to increase, they will go back to living in a group and turn wild. They will start hunting like wild animals which will be a danger for human life.” Humans are still learning how to live together with dogs. This relationship can be wonderful but difficult. But people will continue to share their lives with man’s best friend: the dog.