When you are on a long road trip or in a traffic jam during a daily-commute ， it may seem harmless to connect your phone to your car's USB port．But unless you really need to use your phone，charging(充电)your iphone during your commute could be a big mistake．

    Why? For starters，the USB port in our car probably provides less electricity than your phone really needs to charge．As a result，your phone might stop working while it charges.

    Many people may notice that on their way home from work their phone charged very little during their 30-60 minute commute，"says Brad Nichols，an engineer at Staymobile．"It is mostly because that the phone is using more power than the car charger isproviding it．"

    Nichols also says that your phone could receive too much power，especially if you are using a cigarette lighter port to charge up．Most cigarette lighters can provide more power than most chargers can afford．If a charger cannot keep providing the proper power, it may make the phone broken．

    Charging your phone could do harm to your car's battery(电池)，too．This usually isn't a big deal for those who own new cars with healthy batteries，Nichols says．But if your car is older，you might not want to charge your phone through its USB port．

    Most importantly，it's not safe to use your phone while driving．"Anytime a person's hands leave the wheel or eyes leave the road，it becomes dangerous for them and the other people around them," Nichols points out．Bottom line：Play it safe，and wait until you get home to charge your phone．

    Some people seem to have unusual memories. Zheng Aiqiang, a "memory athlete" on TV show Super Brain, can remember 2,660 numbers in just one hour!

    You would think people like him must have special brains. But according to a recent study by researchers from America and Holland, the brain structure (结构) of ordinary people and 23 of the world's leading memory athletes shows no difference.

    Good memories can be trained. New research in the magazine Neuron suggests that a person will get a super memory with just six weeks of hard training.

    Researchers found that a technique (技巧) called loci, invented by the ancient Greeks, can greatly help improve memory.

    By using loci, you are using your imagination to improve the brain's memory networks. You can link (关联) something you need to remember with a place that you know very well. For example, to remember a list of numbers, imagine yourself walking through your house. Each thing is linked to a number. For example, zero could be the handle on the door and five could be the painting on the wall.

    In one study, some ordinary people were given 20 minutes to remember 72 nouns. At the beginning, they could only remember 26 words, but when they were taught loci, they could remember 62 words.

"Not everyone can become a memory winner. But everyone using the technique can improve his memory greatly," said Boris Konrad, one of the researchers in the study.

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    These days haze(雾霾) is around us here and there. In fact, everyone has the power to change their living habits to help reduce it. Many local governments call on their people to take action to make the air cleaner.

    Transport is one of the biggest contributors(促成物) to haze. When, where, bow, why and what you drive all affect air quality. When one drives to work for one year, he uses as much energy as a bus rider uses in 10 years. So walk or ride your bicycle to work or school whenever possible. If it is necessary, you can use public transport instead of your car. Each person using public transport for a year instead of a car can save nearly a tonne of pollutants, including CO₂, from going into the atmosphere.

    Carpooling is another way to reduce carbon emissions (排放). Carpooling is the sharing of car journeys so that more than one person travels in a car. It immediately reduces your car's emissions by half.

    What you do inside your living space can have a big effect on the air quality outside it. You can do a lot of things inside and around your home that will help you pollute less and save some money.

    A large amount of our energy supply comes from burning coal, another contributor to haze. By cutting down your electricity use, you are cutting down on haze. So you may try to reduce your use of electricity by turning off lights, using your air conditioner wisely during the summer months, or updating some of your electrical appliances to low-energy models. For example, you can use energy-saving lamps that require less energy and last 10 times longer than common bulbs.

    A dog can't speak any words, but it can "talk". It has feelings just as you do.

    Sometime it may feel angry or afraid. Watch a dog closely, and you can find out how it feels. You can see what it is trying to tell you. When you are afraid, you may look down. When a dog is afraid, it may run away. When you are angry with other people, you stare at them. An angry dog also stares. Sometimes the hair along its back stands up.

    Do you feel guilty(有罪) when you do something you shouldn't do? Dogs can feel guilty, too. Sometimes when l come home, my dog gives me a guilty look. Then I know he did something wrong. Dogs need love and care. Some dogs are very unhappy when they are alone for a long time. Some dogs even snap(撕咬）if they don't get enough care.

    You may have a dog or you may know a dog. Take care of it well if you want to have fun with it. Take it for a walk. Don't make it do too many things. Try not to punish it again and again for doing the same thing. Always remember, a dog has needs and feelings just as you do. Talk to a dog, and it will talk to you.

    Robots seem very new to most people. But they have a long history. The first one was made by a Greek inventor. You may have seen robots in some films. The robots in these films are stronger, faster and more clever than people in real life. Most robots are used in factories. They are used to do many dangerous, difficult or boring jobs. Some people can't look after themselves and move around. They need dogs to help them. These dogs are called guide dogs. Scientists are making robot dogs to help them. In the future, robot dogs might take the place of these guide dogs.

    Robots are also used in American hospitals. At one hospital, a robot takes meals from the kitchen to the sick people's rooms,   it never loses its way because it has a map of the hospital in its computer system.

    In the future, robots will work in space. But robots will never take the place of human beings, though they can help us in a lot of different ways.

    I'm sure you all know how important recycling is. Recycling is when you take old things and turn them into new things. It sounds like magic. But it's actually very scientific.