In recent years, much of the sea ice that polar bears use as a hunting platform for seal meals has melted, forcing some bears — particularly young males — farther north or onto land, where they are not as skilled at hunting. When stuck on land for months, a polar bear typically is forced to survive on its own fat reserves.

    The bears were listed earlier this year as a threatened species under the U. S. Endangered Species Act as populations have declined. Meanwhile, snow geese are booming near the western Hudson Bay, and there are in fact too many of them. Their eggs can be a good food source. The geese nest on tundra (冻原；苔原) that some bears have retreated to.

    "Over 40 years, six subadult (接近成年的) male bears were seen among snow goose nests, and four of them were sighted after the year 2000," says Robert Rockwell. "I've seen a subadult male eat goose eggs whole or press its nose against the shell, break it, and eat the contents."

    Ice is melting, on average, 0.72 days earlier each year in the region studied. Snow geese are hatching eggs about 0.16 days sooner each year, according to Rockwell and his graduate student Linda Gormezano. Current trends indicate that the arrival of polar bears will correspond to the average hatching period in 3.6 years, and egg consumption could become a viable option, which the researcher concluded in a statement released today.

    A polar bear, the largest land carnivore (食肉动物), would need to consume the eggs of 43 nests to replace the energy gained from the average day of hunting seals, but Rockwell and his colleagues figure that while many polar bears may starve in coming years, the resourceful animals just might survive disappearance.

    Polar bears survived a warm period about 125,000 years ago, when sea level was 12 to 18 feet higher than it is now and trees lived above the Arctic Circle, the scientists point out.  "They've been through the warm period before，" Rockwell said.

    The polar bears' potential movement to a diet of more eggs brought to mind a quote by Ilkoo Angutikjuak, an Inuit who lives in the Canadian province of Nunavut, in the February 2008 issue of Natural History magazine, Rockwell said. Angutikjuak said: "The animals will adapt. I've heard that because they depend on sea ice, polar bears will disappear, but I don't believe it. They are very adaptable. As the sea ice changes, polar bears might get skinnier and some might die, but I don't think they will disappear."

    Next time you raise an eyebrow at the views of your partner, friend, sibling （兄弟姐妹） or colleague, remember they could be helping to make you smarter. New research shows that intelligence is not fixed but can be improved throughout adulthood by family members, bright mates and intellectually challenging careers. The study challenges the commonly held belief that intelligence is fixed by the age of about 18.

    Scientific consensus suggests that intelligence is controlled by genes, with environmental factors such as schooling and nutrition playing a partial role up to this age. After this point, IQ scores become steady（稳定的）. But James Flynn, professor of political studies and psychology at the University of Otago in New Zealand, argues that people can "upgrade" their own intelligence throughout their lives. He believes intellectual stimulation（刺激）from others is important as the "brain seems to be rather like a muscle - the more you use it, the stronger it gets". However, the opposite is also true - so people sharing a home or workplace with those who are intellectually challenged risk seeing their IQ levels nosedive as a result.

    Professor Flynn analyzed US intelligence tests from the last 65 years and created new IQ "age tables". He found a bright ten-year-old with brothers and sisters of average intelligence will suffer a five to ten point IQ disadvantage compared to a similar child with equally bright brothers and sisters and special educational treatment to help pull them up.

    Professor Flynn also concluded that although genetics and early life experiences determine about 80% of intelligence, the remaining 20% is linked to lifestyle. This means that people can raise their IQ, or allow it to fall, by ten points or more. He suggested the best way to improve IQ levels is to mix with bright friends, find an intellectually challenging job and marry someone cleverer.

    Have you ever imagined the benefits that a good memory can bring to you? {#blank#}1{#/blank#} Here are four ways to improve your memory.

    {#blank#}2{#/blank#} There is evidence that sleep plays a vital role in the consolidation of memories relating to learning motor skills, such as learning to play a musical instrument or ride a bike. Having a full night's sleep soon after gaining a new skill helps consolidate the processes involved, so they can later be performed well.

    It's rewarding to continue education. Older people are often told to adopt a “use it or lose it” approach to maintaining cognitive (认知的) function. {#blank#}3{#/blank#} In a 2016 study, US researchers found participants aged 60-90 who spent 15 hours a week for three months learning a complex skill, such as digital photography, saw significant improvements in memory tests.

    Taking a break counts. {#blank#}4{#/blank#} More than a century ago, German scientists showed that people performed almost twice as well in memory tests if they took breaks.

It's useful to stay social. Having an active social life delays memory loss as we age, US scientists who asked people in their 50s and 60s to do memory tests every other year between 2001 and 2007 found the decline in recall abilities of their most sociable subjects to be half that of the least well connected. {#blank#}5{#/blank#}

A. Sleeping well helps strengthen memories.

B. Old people should participate in easy activities

C. Yoga, meditation or other relaxation techniques may help.

D. Memories can be destroyed if the brain doesn't have enough rests to sharpen them.

E. In fact, when it comes to memory, research suggests that only certain types of mental activities help.

F. Being able to remember important pieces of information can give you a powerful advantage in your life.

G. Having good friends, volunteering for charities and other forms of social engagement also protect memory.

    Hiking is a great way to get active and reduce stress while you are exploring the city. Visit our page to find some of the best free walking tours across New York City.

Community Days at Conference House Park

Wednesday, September 19, 2018 12:00p.m.—2:00p.m.

    Enjoy new gardens at the Visitor Center. Explore and help repair the three self-designed gardens: vegetable, native plant, and sculpture. Experience kids crafts，adult art programs, Tai Chi and more in this lovely setting.

    Position: Conference House Park, 298 Satterlee Street, Staten Island

    Event Organizer: Conference House Park

    Phone Number: (718)227-1463

    Contact Email: john.kilcullen@parks .nyc.qov

    Greenbelt on the Go

Tuesday, August 14, 2018 10:00a.m.—11:30a.m.

    Join us for relaxing walks through our parks. Enjoy the pretty views of them, as we point out a few of the distinct features that make each park special. The length of each hike will be determined by the pace of the group. Registration is required. To register, please email naturecenter@sigreenbelt.org before August 14.

    Position: Greenbelt Nature Center in Blood Root Valley, 700 Rockland Avenue at Brielle Avenue Staten Island

    Event Organizer: Staten Island Greenbelt Conservancy, Greenbelt Environmental Education Department

    Phone Number: (718)351-3450

    Contact Email: naturecenter@sigreenbelt.org

    Adult Afternoon Hikes

Wednesday, October 10, 2018 1:30p.m.—3:00p.m.

    Get familiar with the Greenbelt and local parks by hiking with other adults! You're encouraged to bring small meals and drinks for the break time.

    Position: Greenbelt Nature Center in Blood Root Valley, 700 Rockland Avenue at Brielle Avenue Staten Island

    Event Organizer: Staten Island Greenbelt Conservancy, Greenbelt Environmental Education Department

    Phone Number: (718)351-3450

    Contact Email: naturecenter@sigreenbelt.org

    The South Pole at Wards Point

Thursday, November 15, 2018 7:00a.m.—7:00p.m.

    The three miles of nearby natural shoreline are a sandy beach. Shells, rocks, and stones of every shape and size can be found here. Not to be missed are the park's other attractions: acres of woodland, four galleries, and five historic houses!

Position: Conference House Park Visitor Center in Conference House Park, 298 Satterlee Street, Staten Island

    Event Organizer: Conference House Park

Contact Email: john.kilcullen@parks.nyc.qov

    We often ask these questions: Are African wild dogs really dogs? What's the difference between African wild dogs and the dogs we know as pets? For one thing, African wild dogs, which live in Africa, only have four toes, while domestic(驯养的）dogs and wolves have five. But you won't want to count for yourself, because they are truly wild animals.

    “Wild dogs are not somebody's domestic dogs that ran away and didn't come back, although some people used to think that,” explains Dr. MeNutt, who studies these animals at Wild Dog Research Camp in the African country of Botswana. “They are actually Africa's wolves, and just like wolves, and they do not make good pets. They need to be out in the wild doing what they are supposed to do — find the food they need to survive and feed their babies.” In fact, they travel so far that researchers have to use radio collars (颈圈) to keep track of them. The collars send out radio signals that tell people where the dogs are. No two wild dogs have the same pattern of coats, so it is easy to tell them apart.

    African wild dogs are smart and sociable, like pet dogs. Adult wild dogs, male and female, are willing to take good care of young ones.

    Millions of domestic dogs live on the planet, but there are probably fewer than 6000 African wild dogs left. Humans hunt them and farmers who don，t want them to go after cows and sheep poison them. Humans are also destroying the wild, natural habitat (栖息地) they need to survive in. Fortunately, today more farmers are finding other ways to protect their cows and sheep from African wild dogs instead of killing the animals.

Try This at Home!

    Are you looking for a new pastime that will create a balance between physical activity and relaxation? Then yoga may be the perfect choice for you. Yoga can be practiced by people of all ages and levels of fitness.{#blank#}1{#/blank#} It's a great way to strengthen your muscles and become more flexible.

    In the 1930s, Indian Sri Tirumali and K. Pattabhi developed one of the most popular forms of yoga practised worldwide today. They worked together using an ancient Sansknt text called Yoga Korunta to create a set routine of yoga movements and breathing exercises. {#blank#}2{#/blank#}

    Ashtanga is different from other forms of yoga. It is a very powerful form of aerobic (有氧的)exercise which creates deep heat in the body. {#blank#}3{#/blank#} In other forms of yoga, however, the routine can change each time and the stretching exercises aren't aerobic.

    {#blank#}4{#/blank#}As well as making you stronger and more flexible, it can also help you to stay calm. By focusing on your breathing while doing physical exercise, you are able to get a balance between mind and body. In addition, yoga helps to make us healthier so we are less likely to get common illnesses like colds.

    Furthermore, yoga encourages you to think about what you're doing. Often you will close your eyes while doing certain movements.{#blank#}5{#/blank#}After a few lessons you'll stop looking at what the others around you are doing. You will stop comparing yourself and start focusing on yourself.

A. It can also be done anywhere at any time.

B. The result of their co-operation was ashtanga yoga.

C. Whatever kind of yoga you choose, there are many long-term benefits.

D. This allows you to concentrate better and it makes you less competitive.

E. Every time someone practices ashtanga, he or she does exactly the same movements.

F. If you're interested in yoga, but can find a class near you, then it might be   an excuse to travel.

G. Recently, it has become extremely common for beginners as well as advanced yoga students to go on yoga holidays.