Since the 1970s, scientists have been searching for ways to link the brain with computers. Brain-computer interface (界面) (BCI) technology could help people with disabilities send commands to machines.

    Recently, two researchers, Jose Milan and Michele Tavella from the Federal Polytechnic School in Lausanne, Switzerland, demonstrated（展示）a small robotic wheelchair directed by a person's thoughts.

    In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.

    “Our brain has billions of nerve cells. These send signals through the spinal cord (脊髓) to the muscles to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles,” Tavella says.  “Our system allows disabled people to communicate with external world and also to control devices.”

    The researchers designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.

    Prof. Milan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. “The practical possibilities that BCI technology offers to disabled people can be grouped in two categories: communication, and controlling devices. One example is this wheelchair.”

    He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can benefit from. And the other is to guarantee that they can use the technology over long periods of time.

    Before there was the written word, there was the language of dance. Dance expresses love and hate, joy and sorrow, life and death, and everything else in between.

    {#blank#}1{#/blank#}We dance from Florida to Alaska, from north to south and sea to sea. We dance at weddings, birthdays, office parties and just to fill the time.

    "I adore dancing," says Lester Bridges, the owner of a dance studio in Iowa. "I can't imagine doing anything else with my life." Bridges runs dance classes for all ages. "Teaching dance is wonderful. {#blank#}2{#/blank#}It's great to watch them. For many of them, it's a way of meeting people and having a social life."

    {#blank#}3{#/blank#}"I can tell you about one young couple," says Bridges. "They're learning to do traditional dances. They arrive at the class in low spirits and they leave with a smile. {#blank#}4{#/blank#}"

    So, do we dance in order to make ourselves feel better, calmer, healthier? Andrea Hillier says, "Dance, like the pattern of a beating heart, is life. Even after all these years, I want to get better and better.{#blank#}5{#/blank#} I find it hard to stop! Dancing reminds me I'm alive."

    These are instructions for making invisible ink using baking soda.

    We're reading a book or opening an envelope when, all of a sudden, there's a sharp pain on our finger. You see a little bit of blood and realize you've just gotten a paper cut.

    Dr. Hayley Goldbach, a resident dermatologist at UCLA Health, spoke about why paper cuts are so jagged, how the element of surprise leaves us in more pain and how to make sure they heal quickly.

    Dr. Goldbach explained that one reason paper cuts hurt so much is where they occur: primarily on the finger. We have nerve endings all over the body," she said. "In places where there is refined movement and sensation--like the lips or tips of the fingers-they have a high density of nerve endings." These nerve endings are known as nociceptors and they send signals to the brain about things that could cause a break in the skin, such as extreme hot or cold temperatures and chemicals.

    Another reason why paper cuts hurt so much is that you're using your hands throughout the day meaning that the wound is constantly getting opened. "You often get paper cuts on the pad or the tip of the finger, different from where you'd get a knife cut," said Dr. Goldbach. "It's hard not to use your hands, so there's constant pressure on the wound without u chanee for it to heal."

    "The paper itself is another reason why these superficial cuts leave us in so much pain. Paper might look and seem smooth but, if you study it under a microscope, the edge is actually jagged." Paper is quite sharp jagged-it's a bit of serrated edge," said Dr. Goldbach."It cuts you pretty quickly before you have the chance to realize it."

    Additionally, paper cuts are quite shallow, which makes them even more annoying to deal with.

    Dr. Goldbach added that there are mental and emotional elements that cause paper cuts to hurt more than other cuts. "There's the psychological element of surprise, and it happens so quickly that you don't have time to withdraw your hand "she said" With some other injuries, you feel pressure so you have time to react."

    She also added that because we don't expect to hurt ourselves while working with paper, the surprise of cuts leaves us in further pain. "We tend to be careful with a knife-you're being careful on purpose: because you know there: s a danger, "said Dr Goldbach. While we are careful with knives, we are not so careful with paper.

A Housewarming Party

    A housewarming party is a special party to be held when someone buys or moves into a new apartment or house. The person or people who bought the apartment or house or moved are the ones who throw the party.{#blank#}1{#/blank#}It also gives people a chance to see what the new home looks like. It is an opportunity to fill the new space with love and hopeful presents.

    It is traditional to bring a gift to a housewarming party{#blank#}2{#/blank#}Some common items(物品) people will put on a gift registry include kitchen tools like knives and items like curtains. Even if there isn't a registry, a good housewarming gift is something to decorate the new house with, like, a piece of art or a plant.{#blank#}3{#/blank#}It is often appreciated since at a housewarming party there isn't a lot of food served, usually just appetizers or sandwiches.

    {#blank#}4{#/blank#}The host or hostess of the party will, however, probably give all the guests a tour of their new home. Sometimes, because a housewarming party happens shortly after a person moves into a new home, people may be asked to help unpack boxes. This isn't usual though.

    Housewarming parties get their name from the fact that a long time ago people would actually bring firewood to a new home as a gift so that the person could keep the home warm for the winter.{#blank#}5{#/blank#}

A. You can also bring food or drinks to share.

B. Different activities are held to make guests satisfied

C. There are usually no planned activities at a housewarming party.

D. Now most homes replace fires with central heating to keep warm.

E. Different people hold or attend housewarming parties for various reasons.

F. Some people register a list of things they need for their new home at local stores.

G. The party is an opportunity for friends and family to congratulate the person or people on the new home.

Enjoyable Family Picnics

    Going for a picnic is great at any age. It can either be a simple lunch in the park or a family barbecue at the beach. Whether with little kids or just as a romantic afternoon date, picnics can be fun and relaxing. Just remember to prepare.

    Check the weather forecast.{#blank#}1{#/blank#} Picnics are never much fun when it gets too hot or starts to rain. If it is likely to rain, but you still make up your mind to go, think about bringing umbrellas.

    Pick a location suitable for your family's needs. Different locations are for different types of picnics.{#blank#}2{#/blank#} Choose one with a playground for them, and perhaps some bathrooms nearby. Do you want a quiet afternoon to read, or a park with a big field to play soccer on？

    {#blank#}3{#/blank#} Food is the most important part of a picnic, so don't forget it! Remember to bring any utensils (器皿) you might need, as well as napkins and a garbage bag to clean up afterwards. Bring some books, balls or anything else that could be fun. Finally, don't forget your camera.

    Other ideas. If it gets hot in the afternoon, why not try a morning picnic to enjoy the songs of birds in the fresh morning air？{#blank#}4{#/blank#} It can be fun to have a picnic in your backyard. If you're going on a hike, pack a lunch and turn it into a picnic. But remember to bring extra water!

    Remember to prepare, and you'll soon be enjoying picnics wherever you are. But keep in mind that not everything always go as planned.{#blank#}5{#/blank#}

A. What to bring.

B. Do you have little kids？

C. Just learn to laugh and enjoy it anyway.

D. Another idea is to stay at home.

E. Not everybody likes eating outside.

F. It may seem obvious but it's often forgotten.

G. Do you need big trees to keep the heat off on a sunny day?