Our risk of cancer rises dramatically as we age. So it makes sense that the elderly should be routinely screened for new tumors — or doesn't it?

    While such vigilant(警觉的) tracking of cancer is a good thing in general, researchers are increasingly questioning whether all of this testing is necessary for the elderly. With the percentage of people over age 65 expected to nearly double by 2050, it's important to weigh the health benefits of screening against the risks and costs of routine testing.

    In many cases, screening can lead to additional biopsies(活检) and surgeries to remove cancer, which can cause side effects, while the cancers themselves may be slow-growing and may not pose serious health problems in patients' remaining years. But the message that everyone must screen for cancer has become so ingrained(根深蒂固的) that when health care experts recommended that women under 50 and over 74 stop screening for breast cancer, it caused a riotous reaction among doctors, patients and advocacy groups.

    It's hard to uproot deeply held beliefs about cancer screening with scientific data. Certainly, there are people over age 75 who have had cancers detected by routine screening, and gained several extra years of life because of treatment. And clearly, people over age 75 who have other risk factors for cancer, such as a family history or prior personal experience with the disease, should continue to get screened regularly. But for the remainder, the risk of cancer, while increased at the end of life, must be balanced with other factors like remaining life expectancy(预期寿命).

    A recent study suggests that doctors start to make more objective decisions about who will truly benefit from screening—especially considering the explosion of the elderly that will soon swell our population.

    It's not an easy calculation to make, but one that make sense for the whole patient. Dr. Otis Brawley said, “Many doctors are ordering these tests purely to cover themselves. We need to think about the rational(合理的) use of health care and stop talking about the rationing of health care.”

    That means making some difficult decisions with elderly patients, and going against the misguided belief that when it comes to health care, more is always better.

B

    Atlantic puffins（角嘴海雀）are specially used to living on the open sea. Their feathers allow them to stay warm as they float at the ocean's surface or swim underwater. Diving as deep as 60m, they swim by flapping their wings as if flying through the water. There, they hunt herring, capelin, and sand eels.

    Atlantic puffins are also excellent fliers. Flapping their wings at up to 400 beats per minute, puffins can reach speeds of 88km/h.

    April to mid-August is the breeding season for puffins. When a puffin is around three to five years old, it will choose a partner at sea to mate with for life. It is thought that the birds' colourful bills and feet, which fade in the winter and brighten in the spring, help puffins find their potential（可能的）mates.

    Puffins create shelter（庇护所）, about 90cm, in rocky cliffs either in the soil or between rocks. Often, couples will return to the same shelter year after year. At the back of the shelter, they build a nest lined with grasses, seaweed, and feathers. After the female lays a single egg, both parents take turns incubating（孵化）the egg for about 40 days.

    Once the chick hatches, the mother and father will take turns bringing it fish to eat several times a day. Atlantic puffins have the ability to carry several fish in their beaks at one time. The ridges（脊）at the top of their bill hold the fish in place, which allows puffins to keep their mouth open to catch more fish without losing any. In general, they can hold around ten fish in their beak at one time.

    In the wild, puffins can live around 20 years. Their main predator is the great black-backed gull, which can capture a puffin mid-flight or attack a puffin on the ground. Gulls are also a threat because they steal puffins' fish (sometimes right from their mouths), and they pull puffin chicks or eggs from their nests.

    Slowly, so slowly that we never even noticed how it happened, our family stopped talking to each other. Our own worlds opened up to us through the computer or the cell phone or the CD player.

    Family Night was born when Mom called us for dinner. Jessica and I came and sat down. Dad loaded his plate and started to rise from the table.

    “Where are you going?” Mom questioned.

    “To the living room. I have some work,” Dad replied as he hurried away. Mom's face got tight, but she said nothing. About two minutes later, my cell phone buzzed. Jessica kept her earphones on during most of the meal. Mom was clearly upset.

    Family Night started the next week. Mom established three rules: no phones, no music, and no leaving the table. Everyone would eat together and play a game together “like a real family.”

    All seemed to be going according to Mom's plan until the first buzz of a cell phone. After dinner, we had been playing the board game for only ten minutes when another cell phone let out a shrill scream. This time the phone belonged to my father.

    “Work's calling. I have to answer,” he whispered as he hurried out of the room.

    Mom sighed, but she forced a smile and encouraged us to continue with the game. We kept playing through every interruption afterwards: the beeping of Jessica's phone, the buzz of another text message from Darnell, the soothing voice announcing the arrival of an e-mail on Dad's computer. When the game was over, Mom released us to our rooms.

    That first Family Night was not a success, but Mom soldiered on. Every Monday evening we silenced our electronics and gathered around the table; and each time, setting aside our technological toys became a little easier. The next two months my father would be taking business trips. We wouldn't be able to have Family Night every Monday.

    To my surprise I realized that I would miss those few hours each week when the house was filled with my family's laughter and conversation. I was also glad to know that when we really wanted to, we could silence the electronic buzz and just be a family again.

    Last week, Vodafone started a test of the UK's first full 5G service, available for use by businesses in Salford. It is part of its plan to trial the technology in seven UK cities. But what can we expect from the next generation of mobile technology?

    One thing we will see in the preparation for the test is lots of tricks with the new tech. Earlier this year, operators paid almost £ 1.4 billion for the 5G wavelengths, and to compensate for that cash, they will need to catch the eye of consumers. In September, Vodafone used its bit of the range to display the UK's first hologram (全息) call. The Manchester City captain Steph Houghton appeared as a hologram in Newbury. It isn't all holograms, however: 5G will offer faster internet access, with Ofcom (英国通讯管理局) suggesting that video that takes a minute to download on 4G will be available in just a second.

    The wider application is to support connected equipment on the "internet of things" -not just the internet-enabled fridge that can reorder your milk for you, but the network that will enable driverless cars and delivery drones (无人机) to communicate with each other.

    Prof William Webb has warned that the technology could be a case of the emperor's new clothes. Much of the speed increase, he claims, could have been achieved by putting more money in the 4G network, rather than a new technology. Other different voices have suggested that a focus on rolling out wider rural broadband access and addressing current network coverage would be more beneficial to the UK as a whole.

    Obviously, 5G will also bring a cost to consumers. It requires a handset for both 5G and 4G, and the first 5G-enabled smart phones are expected in the coming year. With the slow pace of network rollout so far, it is likely that consumers will end up upgrading to a new 5 G phone well before 5 G becomes widely available in the next couple of years.

    World-famous scientist Stephen Hawking has died at the age of 76. He was often called the most brilliant theoretical physicist since Albert Einstein. But his amazing career actually started as a young man who struggled to get around to doing his homework at Oxford University where he studied physics. He then went on to Cambridge to research cosmology, the study of the origin of universe.

    When he was 21, Hawking's life hit a big hurdle. He was diagnosed with Motor Neurone Disease. The disease causes the brain to stop sending messages to a person's muscles. At the time, doctors said he would only live for around 2 years, but he proved them very, very wrong.

    And with the help of a special wheelchair and speech computer, Hawking spent much of his time researching the beginning of the universe and black holes. His most famous discovery was probably when he demonstrated that black holes emit some radiation, which has since become known as Hawking Radiation. He also spent a lot of time thinking about what existed before the big bang.

    Hawking wrote books that explained his big ideas in ways that could be understood by the average person. In 1988 he published A Brief History of Time. It became really popular and sold more than 10 million copies. However, he wasn't just known for his books. He also had a lot of fun becoming a regular on TV screens around the world. He even had a big Hollywood film made about his life.

    Throughout his life Stephen Hawking inspired people to look beyond our planet and expand our knowledge of the universe. His family says that he'll be greatly missed and the legacy of his amazing ideas will live on.

    What is eBay? The simple answer is that it is a global trading platform where nearly anyone can trade practically anything. People can sell and buy all kinds of products and goods, including cars, movies and DVDs. sporting goods, travel tickets, musical instrument clothes and shoes- the list goes on and on.

    The idea came from Peter Omidyar, who was born in Paris and move to Washington when he was still a child. At high school, he became very interested in computer monogramming and after graduating from Tuft University in 1988, he worked for the next few years as a computer engineer. In his free time he started eBay as a kind of hobby, at first offering the service free by word of mouth.By1996 there was so much traffic on the website that he had to upgrade (升级) and he began charging a fee to members Joined by a friend, Peter Skoll, and in 1998 by his capable CEO, Meg Whitman, he has never looked back. Even in the crashes of the late 1990s, eBay has gone from strength to strength. It is now one of the ten most visited online shopping websites on the internet.

    eBay sells connections, not goods, putting buyer and seller into contact with each other. All you have to do is take an e-photo, write a description fill out a sales form and you are in business; the world is your market place. Of course for each item (商品) sold eBay gets a percentage and that is a great deal of money. Every day there are more than sixteen million items listed on eBay and eighty percent of the items are sold……