My parents were in a huge argument, and I was really upset about it. I didn't know who I should talk with about how I was feeling. So I asked Mom to allow me to stay the night at my best friend's house. Though I knew I wouldn't tell her about my parents' situation, I was looking forward to getting out of the house. I was in the middle of packing up my things when suddenly the power went out in the neighborhood. Mom came to tell me that I should stay with my grandpa until the power came back on.

    I was really disappointed because I felt that we did not have much to talk about. But I knew he would be frightened alone in the dark. I went to his room and told him that I'd stay with him until the power was restored. He was quite happy and said, “Great opportunity.”

    “What is it?” I asked.

    “To talk, you and I” he said. “To hold a private little meeting about what we're going to do with your mom and dad, and what we're going to do with ourselves now that we're in the situation we are in.”

    “But we can't do anything about it. Grandpa,” I said, surprised that here was someone with whom I could share my feelings and someone who was in the same “boat” as I was.

    And that's how the most unbelievable friendship between my grandfather and me started. Sitting in the dark, we talked about our feelings and fears of life — from how fast things change to how they sometimes don't change fast enough. That night, because the power went out, I found a new friend, with whom I could safely talk about all my fears and pains, whatever they may be. Suddenly, the lights all came back on. “Well,” he said, “I guess that means you'll want to go now. I really like our talk. I hope the power will go out every few nights!”

    My wife and I owned two doge that we had owned before we met and brought into the marriage. Her dog was a pit bull(斗牛犬) named Zack, and he hated me. When our daughter was born, I was worried that the family pit bull would be dangerous to have around our young daughter. I warned my wife that the dog would have to go at the first sign of trouble. I said, “If he nips(啃咬) at the baby, he's gone.”

    We brought our daughter home in a car seat, and both dogs sniffed(嗅）and licked her, tails wagging. I had to pull Zack away from her because he wouldn't stop licking her. Zack immediately became my daughter's protector, and when she was lying on a blanket on the floor, he always had one foot on the blanket.

    Zack loved my daughter extremely, and when she became a little older always walked her to bed, and then slept on the bed with her. He somehow knew whenever it was time to go upstairs, and he would wait at the bottom of the stairs for her, and then follow her up to bed.

    Zack was poisoned by some neighbor kids, and we had one of the worst days of our lives. Watching my daughter say goodbye to him as he lay still on the kitchen floor, my wife and I were both sobbing.

    At 8:00 that night, my daughter walked to the stairs to go to bed. At that moment, all three of us realized what was about to happen. My daughter looked at her mother and me with a look of horror and panic. It was at that moment that my dog, Sam who loved my daughter dearly, stood up, walked over to her, and nudged her with his head. He put his foot on the stairs, and looked up at her. They walked up to bed, with my daughter holding his neck tightly.

    For the next six years, until he died, Sam waited for her by the stairs each night.

    Artificial intelligence (AI) technology may soon be a useful tool for doctors. It may help them better understand and treat diseases like breast cancer in ways that were never before possible.

    Rishi Rawat teaches AI at the University of Southern California's (USC) Clinical Science Center in Los Angeles. He is part of a team of scientists who are researching how AI and machine learning can more easily recognize cancerous growths in the breast. Rawat provides information about cancer cells to a computer. He says this data helps the machine learn." You can put the data into computers and they will learn the patterns and the pattern recognition is important to making decisions."

    David Agus is another USC researcher. He says machines are not going to take the place of doctors. "Computers will not treat patients, but they will help make certain decisions and look for things that the human brain can't recognize by itself. Once a confirmed cancerous growth is removed, doctors still have to treat the patient to reduce the risk of cancer returning. The form of treatment depends on the kind of cancer."

    Currently, researchers take a thin piece of tissue, put it on a small piece of glass and add color to better see the cells. That process could take days or even longer. Scientists say artificial intelligence can do something better than just count cells. Through machine learning, it can recognize complex patterns, or structures, and learn how the cells are organized.

    The hope is that machines will soon be able to make a quick identification of cancer that is free of human mistakes. "All of a sudden, we have the computing power to really do it in real time. We couldn't have done this, we didn't have the computing power to do this several years ago, but now it's all changed." Agus adds that the process could be done for almost no cost in the developing world. He says that having a large amount of information about patients is important for a machine to effectively do its job in medicine.

    The University of Southern California researchers are now only studying breast cancer. But doctors predict artificial intelligence will one day make a difference in all forms of cancer.

    Eating out is such a pleasure ― the food, the wine, the joy of having it all brought to you by someone else—that it's a pity to ruin the experience by sharing it with other people.

    Well, I do like visiting restaurants with friends. But dining out alone has its own very special attractions. For a start you can give all your attention to the food. There's nothing worse than having to invent and deliver an opinion on school league tables or Sanchez's move to Manchester United, plus listen to everyone else's opinions, when all you really want to do is enjoy each mouthful along the way.

    A second great thing about eating out alone is the chance to combine food with one of life's other true pleasures: reading. You have to plan this carefully: Indian or Chinese restaurants are best ― you need food you can eat with just one hand, leaving the other free to hold your reading material.

    But perhaps the biggest attraction of a table for one is the chance it gives to people-watching. Restaurants and the different reasons for visiting them ― first date, business meeting, night out with friends ― produce human behaviour of surprising richness and variety. Will the man selling his business idea get any joy out of his possible investor (投资者)? Will the married couple think of anything to say to each other before their main courses arrive?

    This "human zoo" part of eating out alone is one of the reasons I'd hate to be famous: everyone would be watching you, so you wouldn't be able to watch them. The snooker player Steve Davis says this was one of the strangest consequences (后果) of becoming well-known: he got very worried about his eating in public, almost to the level of doubting whether he was "doing it right."

    So next time you're considering your eating out choices, remember the advice of the businessman Nubar Gulbenkian: "The best number for a dinner party is two ― myself and a super head waiter."

    Some colors people see late at night could cause signs of clinical (临床的) depression. That was the finding of a study that builds on earlier study findings. They show that individuals who live or work in low levels of light overnight can develop clinical depression. Doctors use the word "clinical depression" to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and thoughts of death or suicide.

    In the new study American investigators designed an experiment that exposed hamsters (仓鼠) to different colors. The researchers chose hamsters because they are nocturnal which means they sleep during the day and are active at night.

    The animals were divided into four groups. One group of hamsters was kept in the dark during their night-time period. Another group was placed in front of a blue light a third group slept in front of a white light while a fourth was put in front of a red light.

    After four weeks the researchers noted how much sugary water the hamsters drank. They found that the most depressed animals drank the least amount of water.

    Randy Nelson heads the Department of Neuroscience at Ohio State University. He says animals that slept in blue and white light appeared to be the most depressed. "What we saw is that these animals didn't show any sleep uneasiness at all but they did mess up biological clock genes and they did show depressive sign while if they were in the dim (微弱) red light they did not."

    He notes that photosensitive (感光) cells in the eyes have little to do with eyesight. He says these cells send signals to the area of the brain that controls what has been called the natural sleep-wake cycle.

    He says there's a lot of blue in white light. This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness.

When it comes to having fun in the sun, it's easy to lose track of time. If you're not careful, this can be quite dangerous.{#blank#}1{#/blank#}But it can easily be prevented—all you need is a little sunscreen.

{#blank#}2{#/blank#}People have been using chemical pastes to protect themselves from the sun for centuries. But the first modern sunscreen sold on the market was offered by French company: L'oreal in 1935.

Several other companies were quick to release their own sunscreens. Perhaps the biggest advancement in the world of sunscreen came in the 1970s, when scientists started looking at the sun protection factor, or SPF.{#blank#}3{#/blank#}

The advantages of using sunscreen are obvious. It limits the painful effects of sunburn.{#blank#}4{#/blank#}Millions of people have died from skin cancer caused by ultraviolet rays from the SUITL. Remember to apply sunscreen 30 minutes before going outside.

Unfortunately, there are many mistaken ideas about sunscreen.{#blank#}5{#/blank#}Some also think you only need to put it on once for a whole day's protection or that you don't need it on cloudy days. None of these things are true. Experts say you should apply sunscreen every two hours when outside in the daytime, no matter how dark your skin is or what the weather is like.

A. And it can even save your life.

B. Sunscreen is not exactly a recent invention.

C. Choosing a sunscreen isn't as simple as it used to be.

D. In direct sunlight, sunburn can occur in less than 15 minutes.

E. This rating is a number that shows how effective a sunscreen is.

F. It's believed that you don't need much sunscreen if you have dark skin.

G. Some think a good method is to cover as much as possible with protective clothing.