Many people believe that you lose the ability to learn new languages as you get older. Language experts, however, will tell you that you're never too old to learn a new language. As you get older, it can be more difficult to learn a new language, though.

    Children and adults learn new languages in different ways. For children, language is their life. They study for thousands of hours every year, because they need to learn languages to become part of their communities. Adults, on the other hand, are already part of a language community. Learning a new language means becoming part of another language community, and adults rarely get the chance to practice as much as young children do.

    Moreover, children learning a new language are expected to make mistakes. This gives them freedom when learning to be daring and confident. Adults, however, often feel pressured to be perfect when learning a new language. This can discourage many people and make it even harder to learn a new language.

    When young children learn a new language, they come to see various languages as a “normal” part of society. This mindset （思维模式） helps them embrace learning a new language without feeling like they're doing something unusual or “too hard”.

    So if you want to learn a new language, go for it! It's never too late to learn a new language. If you're older, it may take more work, but it can be done. If you're a young child, though, now is the time to step out and learn a new language!

    There is no doubt that many parents want to mold (塑造)their child to be better, faster, smarter and more skilled. Even though human parents can't do that, a robot that builds its own children can. Scientists at the University of Cambridge in England have created a mother robot that not only creates its own children, but tests out their performance.

    The mother robot analyzes(分析)the performance of each of the “children” it creates, and passes down good characters to the next generation

    For example, as the mother creates them and puts them to work, she measures how they're behaving, and she uses data from this behavior to create the next generation of robots.

    The mother robot can actually build hundreds of child robots and see the performance of these child robots. And if their performance is good, keep their design for the next generation. And if bad, just let it go.

    “We program the robots based on some functions that define(规定)the reward the robots are going to get, depending on the construction that they make. They cannot change their own reward. For the child robot, the longer the distance the robot walks, the better the reward it receives,” said Fumiya Iida, the lead researcher.

    After several generations, the “children” were running twice as fast.

    “The mother robot produced 500 robots to see which one is good and which one is bad,” said Iida.

    The researchers believe that the machines can be used in a car factory, for example, where robot cameras examine each ear in production line, find out any mistakes, and then design a better car.

    Believe it or not, the size of the human brain has become smaller over the past 20,000 years. Scientists argue over whether this means we are becoming more or less intelligent as a species.

    “I'd call that a major downsizing in an evolutionary eye blink (眨眼),” John Hawks told Discover magazine.

    Why is the brain becoming smaller?

    There are different theories to explain it. One is that tens of thousands of years ago, before the decline began, to survive in cold and dangerous conditions, humans needed a stronger and larger body and therefore, a larger head. Also they had to chew the tough meat of rabbits, foxes and horses. As conditions improved, the brain stopped growing, according to supporters of this theory.

    Another theory comes from a recent study by David Geary and Drew Bailey. They found that brain size decreased as population density(密度) increased.

    “As complex societies appeared, the brain became smaller because people did not have to be as smart to stay alive.” Geary told AFP.

    But smaller brain size does not necessarily mean that modern humans are less smart than their ancestors. “Modern humans simply developed different, more complex forms of intelligence,” said Brian Hare.

    Hare's studies focus on two types of great apes: chimpanzees and bonobos. Both are much like humans, but are physically quite different from one another. The bonobo has a smaller brain than the chimpanzee, and is also much less aggressive and more tolerant.

    “When it comes to working out a problem,” Hare said, “chimpanzees are much less likely to accomplish it if it involves working together. Not so with bonobos.”

The smaller brain in modern humans may be evidence that we can cooperate,” Hare told the US National Public Radio.

    Angel Garcia Crespo is a computer engineer at Carlos III University of Madrid in Spain. His group has invented a new way for deaf-blind people to "watch" TV. The idea for the technology grew out of previous work by his group. The team had already worked on making audiovisual(视听的) materials accessible to people with either vision or hearing disabilities. But the group wanted to help people with both challenges. So they asked some deaf-blind people what would help.

    In addition to relying on their sense of touch to communicate, deaf-blind people can also get and send information with a Braille line. The Braille system uses patterns of raised dots to stand for letters and numbers. A Braille line is an electronic machine with a changeable Braille display. Dots rise up or drop down based on the information sent to the machine.

    Now the new system changes TV signals to data a Braille line can use. "The key to the system is the possibility of using subtitles(字幕) to collect TV information, " Garcia Crespo explains. "Subtitles travel with the image(影像) and the audio in electromagnetic waves we don't see. But an electronic system can keep those waves. "

    First, a computer program, or app, pulls out the subtitles and visual descriptions from the broadcast signal. The system then combines the information and changes both into data for Braille.

    Now another app gets to work, which sends the data out to people's Braille lines on demand. "This is done in real time, in less than a second," Garcia Crespo says. This lets a deaf-blind person "watch" TV as it's broadcast. The system will work with various Braille lines, as long as there's a bluetooth connection available. Now, the system is only used in Europe, and it should soon be available in the US.

Whether you're traveling to the next town over or to the other side of the word, careful planning goes a long way toward ensuring your trip is a success. The right preparation helps you avoid potential disasters, such as having your credit card declined or running out of clean clothes to wear. {#blank#}1{#/blank#}

Make your reservations for fights and accommodations.

{#blank#}2{#/blank#}, where you want to stay and how you want to get around, make your reservations. For flights, book around two months out. And don't wait till the last minute for your hotels either. You don't want them to be booked or almost-booked because then prices skyrocket.

Set a travel budget.

Before you do anything, you need to know how much money you will have for this trip. {#blank#}3{#/blank#}, so start your planning by breaking down how much you want to spend on transportation, food, accommodation, sightseeing and any other activities you hope to include in your trip.

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If you're going abroad, you may be required to get a visa. Besides, check the website of your intended country's consulate or embassy to see what is required for you to enter the country. Visas may take weeks or even months to finalize, so check early in the planning process.

Pack appropriate clothing for your destination and trip.

Check the weather at your destination 2-3 days before you depart. This will let you know what type of clothes you need to bring. {#blank#}5{#/blank#}. Will you be expected to wear a suit for a conference, or will you be able to bathe in a bathing suit on the beach?

Earthquakes are common natural disasters. No matter where you are, knowing how to protect yourself and your family during an earthquake is necessary.

Some experts believe that when you feel the ground is shaking, drop down, take cover under a desk and hold on. Most earthquake injuries are the result of being hit by something falling on you. You should stay indoors until the shaking stops. If you are outdoors, don't stay near buildings, trees or power lines. Many people think that in case of an earthquake, they should "get under something" like a doorway or desk, in order to avoid being hurt by falling objects. Rescue experts now say this is the wrong thing to do. For example, in the 1985 Mexico City earthquake, they found hundreds of children in schools, crushed by their desks. However, they could have survived by lying in the aisle (通道，走道) next to their desks.

So find a nice piece of furniture, a chair, a sofa, and lie down, or curl up next to it. A falling roof may compact (压实) the furniture, but will still leave a space for you to survive next to it. This also holds true if you are in a hotel room, especially at night. Get off the bed, and lie down next to it.

In San Francisco's 1989 earthquake, the upper freeway fell on the lower one. People who drove along were crushed in their cars. But they had time to get out and lie down next to their cars. Yes, their cars were crushed, but there was space from top to bottom next to the vehicles for people to survive and wait a rescue.

Doorways and stairways are very unsafe. Stay away from those.

What can we do to keep ourselves safe? Staying calm is the first and most important rule when facing accidents.