Imagine you're standing in line to buy a snack at a store. You step up to the counter and the cashier scans your food. Next, you have to pay. but instead of scanning a QR Code（二维码）with your smart phone, you just hold out your hand so the cashier can scan your fingerprint. Or, a camera scans your face, your eyes or even your ear.

    Now, this type of technology might not be far away. As technology companies move away from the traditional password, biometric（生物特征识别的）security, which includes fingerprint, face and voice ID, is becoming increasingly popular.

    In 2013, Apple introduced the iPhone 5s, one of the first smart phones with a fingerprint scanner. Since then, using one's fingerprint to unlock a phone and make mobile payments has become commonplace, bringing convenience to our lives. And since 2016, Samsung has featured eye-scanning technology in its top smart phones, while Apple's new iphone X can even scan a user's face. But despite its popularity, experts warn that biometrics might not be as secure as we imagine. “Biometrics is ideally good in practice, not so much,” said John Michener, a biometrics expert.

    When introducing the new iPhone's face ID feature, Phil Schiller, Apple's senior vice-president, said. “The chance that a random person in the population could look at your iPhones X and unlock it with their face is about one in a million.” But it's already been done. In a video posted on a community website Reddit, two brothers showed how they were each able to unlock the same iPhone X using their own face. And they aren't even twins.

    “We may expect too much from biometrics,” Anil Jain, a computer science professor at Michigan State University, told CBS News. “No security systems are perfect.”

    Earlier last year, Jain found a way to trick biometric security. Using a printed copy of a thumbprint, she was able to unlock a dead person's smart phone for the police, according to a tech website Splinter. “It's good to see biometrics being used more,” Jain told CBS News, “because it adds another factor for security. But using multiple security measures is the best defense.”

    Drive through any suburb in the U.S. Today, and it's hard to miss the recycling bins that have become companions to America's trash cans. Recycling has become common, as people recognize the need to care for the environment. Yet most people's recycling consciousness extends only as far as paper, bottles, and cans. People seldom find themselves facing the growing problem of e-waste.

    E-waste rapidly increases as the techno- fashionable frequently upgrade to the most advanced devices, and the majority of them end up in landfills (垃圾填埋地). Some people who track such waste say that users throw away nearly 2 million tons of TVs, VCRs, computers, cell phones, and other electronics every year. Unless we can find a safe replacement, this e-waste may get into the ground and poison the water with dangerous toxins (毒素), such as lead, mercury, and arsenic. Burning the waste also dangerously contaminates the air.

     However, e-waste often contains reusable silver, gold, and other electrical materials. Recycling these materials reduces environmental problems by reducing both landfill waste and the need to look for such metals, which can destroy ecosystems.

    A growing number of states have adopted laws to ban dumping e-waste. Still, less than a quarter of this waste will reach lawful recycling programs. Some companies advertising safe disposal in fact merely ship the waste to some developing countries, where it still ends up in landfills. These organizations prevent progress by unsafely disposing of waste in an out- of- sight, out- of- mind location.

    However, the small but growing number of cities and corporations that do handle e- waste responsibly represents progress toward making the world a cleaner, better place for us all.

    Although English is not as old as Chinese, it is spoken by many people around the world every day. English speakers are always creating (创造) new words, and we are often able to know where most words come from.

    Sometimes no one may really know where a word comes from. Did you ever think about why hamburgers are called hamburgers, especially when they are not made with ham? About a hundred years ago, some men went to America from Europe. They came from a big city in Germany called Hamburg. They didn't speak good English, but they ate good food. When some Americans saw them eating a round piece of beef, they asked the Germans what is was. The Germans didn't understand the question and answered, “We come from Hamburg.” One of these Americans owned a restaurant. He had an idea. He cooked some round pieces of bread and started selling them. Such bread came to be called “hamburgers”. Today, “hamburgers” are sold in many countries around the world.

    Whether this story is true or not, it certainly is interesting. Knowing why any word has a certain meaning is interesting, too. This reason, for most English words, can be found in any large English dictionary.

    I was selfish as a teenager. I usually spent my time thinking about myself and taking care of my own needs. I let my older brother do most of the work around the house until he left for college. I let my mom and dad worry about our bills and problems while I read books, played, and lost myself in my own imagination. This didn't change even when I went to college either. I studied hard but only to make my own life better. Even when I started to explore my faith, it was only to increase my own happiness.

    I married after graduation and decided to start a family. Of course, I had no idea what hard knocks reality had in store for my selfish soul. Soon I found myself unemployed, deeply in debt, and with a new baby on the way. l found out that life has little sympathy for spoiled people. In fact, all of the struggles I was going through were beating the selfishness slowly out of me.

    Still, I didn't give up on happiness. I knew that there must be a way to find it. I finally realized, however, that it had to include more than just my own needs, wants, and desires. The answer began to make itself clear one night shortly after my baby boy was born. I got a bottle and held him in my arms. As I was feeding him I looked down and saw his big, innocent, trusting eyes. I smiled and talked to him. Then he smiled and I could feel my heart growing, expanding with love. I felt such peace and joy. At that moment I had a hint of the truth: it is by growing our hearts with love that we find our happiness.

    Carolyn Arends wrote: "The more people you let into your heart, the bigger your heart gets. The more love you get, the more love you have to give. It just keeps growing." So, keep loving, keep living and keep caring. Keep growing your heart today, tomorrow, and always.

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    Surgery that can improve the way a person looks is being more and more popular in the United Stated. This kind of surgery is called cosmetic surgery, and both men and women are turning to this treatment as a way of keeping their appearance young as well as keeping competitive in their jobs. Men especially are beginning to turn to face-lifts, liposuction, and implants to help them look younger. As companies downsize and move younger employees into higher positions, older employees in their late forties and early fifties feel the need to look and act younger in order to stay competitive. A younger look through cosmetic surgery may give an older employee a few more years on the job.

    These operations are not without dangers, however. One young woman had an eye operation to get rid of the bags under her eyes. She described her experience as terrible. She said, "When he started cutting, I was fully awake. Even though he'd given me an injection(注射) near my eyes, I saw everything. "She went on to explain, "I knew I had to keep still because of what he was doing. He was removing fat under my eyes. It took about ten minutes. After he finished I felt I couldn't walk. I was so weak." Her troubles did not end after the operation. For two weeks, her eyes were swollen and almost completely closed, and even dark glasses could not hide the side effects of the operation.

    Liposuction is probably the most popular cosmetic operation in the United States. It seems simple enough. First, a small cut is made over the places where the patient wants the fat removed. Next, a small pipe is put into the cut. A machine is then turned on, and the fat is taken right out of the body. However, as one doctor explained, some problems can happen after the operation. He warned, "Irregular lumps(块) and loose skin can result from this operation. If it is not completely done, liposuction can produce a very lumpy result." Patients often must have more liposuctions to correct the problem.