LEGO has been around forever and is still a favorite toy for children of all     1     (age). Now, however, one teenager has found another use for LEGO, which could help improve the lives of people     2     are missing limbs (手臂).

David Aguilar, a 19-year-old from Spain,     3     (bear) without a right forearm. He was only 9-year-old when he managed     4    ( make) a prosthetic arm (义肢) for himself out of LEGO. Though this LEGO arm was helpful for David, it was not very strong. It wasn’t until nine years later that David was     5    (eventual) able to make another prosthetic arm. It was so strong     6    he could do pushups with it!

Now,     7    (be) a student at Universitat Internacional de Catalunya, David studies bioengineering. In the coming years, David is hoping to make other much     8    (cheap) prosthetics to give more people access to them around the world. He loves using his LEGO arm, and he wants other people who are missing limbs to experience     9     same thing!

It’s so refreshing to see such a clever young man who tries to help others in similar situations     10     his own! We can’t wait to see what David creates in the years to come!

4 . In English it’s common to say, “I know this town like the back of my hand!” While we may know our towns really well, how well do we actually know our hands?     1    

Matthew Longo and his team from University College London studied the left hands of 100 people. With their hands placed palms down under a board, Longo’s team gave the instruction to point to their knuckles (指关节) and fingertips with a marker pen. How did they do? Not that well.

In the experiment, according to Longo, “people think their hands are wider than they actually are.”     2     They were most accurate when finding their thumbs, but became less accurate with each finger, up to their pinkies (小指).

“It is connected to our sense of position,” explained Longo. Humans know where different parts of our bodies are, even if we can’t see them. It tells us whether a joint (关节) is straight or not.     3    So the experiment the team conducted was to find those maps.

    4     On the basis of the study, in our brain’s map, brains “see” areas based on our sense of touch. The stronger the sense of touch in a specific body part is, the bigger that body part seems. An example is our lips. As they have more nerves than our noses, our brain’s map shows our lips are bigger.     5     If you’ve ever had something stuck in your teeth, it probably feels huge! That’s because our tongues also have lots of nerves.

5 . The tooth is the hardest part of your body. Your teeth help you in many ways. For example, they can help you talk. They can also help you have a great smile. And the most important job of your teeth is to chew (咀嚼) your food. But do you know how your teeth grow?

When you are born, you don’t have any teeth. About 8 months later, small teeth begin to appear one by one. These teeth are called baby teeth. They are also called milk -teeth. You won’t have baby teeth forever. They usually begin to fall out when a child is about 6 years old. Then, permanent (永久的) teeth begin to appear. These teeth are larger and more powerful. Most people will have 28 permanent teeth by the time they are 12 years old.

For some people, four more permanent teeth arrive by their 25th. birthday. They are called wisdom teeth (智齿). But these teeth don’t make you smart! Sometimes they bring you pain. If a wisdom tooth brings you too much pain, you should go to a dentist (牙医) and have it pulled out.

6 . The eyes are the windows of the soul (心灵). Having a pair of bright, clear eyes is very important, so we should protect our eyes throughout our lives.

    1    

Don’t read while lying down or walking. Relax after every hour of reading. Keep a distance from the TV set when you watch TV and give your eyes a rest every 30 minutes. Don’t stare at (盯看) the sun or try to read in the darkness.     2     This can damage your eyes easily.

Get your eyes checked often.

Not many people have this habit, but it is necessary. If you feel that there is something wrong with your eyes, get them checked quickly.     3    

Rest your eyes whenever you can.

You can close your eyes for a few seconds or look into the distance for one or two minutes. A small break will relax your eyes.     4    

Besides, be careful when you choose your glasses.     5     Make sure your glasses are right for you. If you don’t feel right, get your glasses changed.

8 . Taking Care of Your Eyes

Many of us don’t pay much attention to eye care. It’s said that if you take care of your eyes, you can surely be healthy.     1     Natural eye care should be put in a number one place. There are several causes leading to poor eyesight like not enough food, genes (基因) and aging (老化).     2     If you happen to work in front of the computer, it is best to take a break every once in a while.

Something dirty can cause redness and make you feel uncomfortable. It is bad for your eyes, too. If this happens, the best way is to clean your eyes by using cold water.     3     For example, sunglasses are not just for fashion but they can also serve as a great way to protect your eyesight from UV rays.

    4     Remember that vitamins A, C and E are good for eyes. Try to eat food groups that have these vitamins. And you should do eye exercises because exercise protects your eyesight, too. If a person exercises regularly and eats the right kind of food, his eyes will stay in good condition for a long time.

    5     In a word, eye care is very important, however old a person is.