At thirteen, I was diagnosed（诊所） with  kind of attention disorder. It made school difficult for me. When everyone else in the class was focusing on tasks, I could not.

          In my first literature class, Mrs.Smith asked us to read a story and then write on it, all within 45 minutes. I raised my hand right away and said,“Mrs. Smith, you see, the doctor said I have attention problems. I might not be able to do it.”

          She glanced down at me through her glasses, “you are no different from your classmates, young man.”

          I tried, but I didn't finish the reading when the bell rang. I had to take it home.

          In the quietness of my bedroom, the story suddenly all became clear to me. It was about a blind person, Louis Braille. He lived in a time when the blind couldn't get much education. But Louis didn't give up. Instead, he invented a reading system of raised dots（点）, which opened up a whole new world of knowledge to the blind.

           Wasn't I the “blind” in my class, being made to learn like the “sighted” students? My thoughts spilled out and my pen started to dance. I completed the task within 40 minutes. Indeed, I was no different from others; Ijust needed a quieter place. If Louis could find his way out of his problems, why should I ever give up?

           I didn't expect anything when I handled in my paper to Mrs.Smith, so it was quite a surprise when it came back to me the next day- with an“A” on it. At the bottom of the paper were these words:“ See what you can do when you keep trying?”

    A man came home from work and found his three children outside， still in their pajamas(睡衣) playing in the mud，with empty food boxes and wrappers thrown all around the front yard.

    The door of his wife's car was open，as was the front door to the house and there was no sign of the dog.

    Walking into the entry，he found an even bigger mess. A lamp had been knocked over. In the front room the TV was loudly blaring(大声播放)a cartoon channel，and the family room was thrown with toys and various items of clothing.

    In the kitchen，dishes filled the sink，breakfast food was spilled on the counter，the fridge door was open wide， dog food was spilled on the floor，a broken glass lay under the table，and a small pile of sand was spread by the back door.

    He quickly headed up the stairs，stepping over toys and more piles of clothes，looking for his wife. He was worried she might be ill，or that something serious had happened. He was met with a small drop of water as it made its way out the bathroom door. As he looked inside he found wet towels， soap and more toys thrown over the floor. Miles of toilet paper lay in a heap(堆) and toothpaste had been put over the mirror and walls.

    As he rushed to the bedroom， he found his wife still sleeping in the bed in her pajamas，reading a novel. She looked up at him，smiled，and asked how his day went. He looked at her puzzled and asked， “What happened here today？”

    She again smiled and answered，“You know every day when you come home from work and ask me what in the world I did today？”

    “Yes，” was his reply.

    She answered，“Well，today I didn't do it.”

    I was sure that I was to be killed. I became terribly nervous. I searched in my pockets to see if there were any cigarettes, which had escaped their search. I found one and because of my shaking hands, I could barely get it to my lips. But I had no matches, they had taken those. I looked through the bars at my jailer. He did not make eye contact with me. I called out to him “Have you got a light?” He looked at me, shrugged and came over to light my cigarette. As he came close and lit the match, his eyes inadvertently（不经意地）locked with mine. At that moment, I smiled. I don't know why I did that. Perhaps it was nervousness, perhaps it was because, when you get very close, one to another, it is very hard not to smile. In any case, I smiled. In that instant, it was as though a spark jumped across the gap between our two hearts, our two human souls. I know he didn't want to, but my smile leaped through the bars and generated a smile on his lips, too. He lit my cigarette but stayed near, looking at me directly in the eyes and continuing to smile.

    "I kept smiling at him, now aware of him as a person and not just a jailer. And his looking at me seemed to have a new dimension too. “Do you have kids?” he asked. “Yes, here, here.” I took out my wallet and nervously fumbled for the pictures of my family. He, too, took out the pictures of his family and began to talk about his plans and hopes for them. My eyes filled with tears. I said that I feared that I'd never see my family again, never have the chance to see them grow up. Tears came to his eyes, too. "Suddenly, without another word, he unlocked my cell and silently led me out. Out of the jail, quietly and by back routes, out of the town. There, at the edge of town, he released me. And without another word, he turned back toward the town.

    “My life was saved by a smile.” Yes, the smile― the unaffected, unplanned, natural connection between people. I really believe that if that part of you and that part of me could recognize each other, we wouldn't be enemies. We couldn't have hate or envy or fear!

    So you want to be a citizen scientist? The National Science Foundation (NSF) has got you covered. NSF supports citizen science across all areas of science, whether your passion is to scan the night sky, or explore your own backyard.

Join a flock of birders

    eBird is an online platform that allows bird-watchers to go online and record their sightings to a database. With more than 100,000 active users, eBird's system is a treasure of information on bird population, distribution and habitat, which users can explore in real time.

Count every drop

    The Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) is the largest provider of daily precipitation observations in the United States. Volunteers set up rain gauges and record data every time a rain, snow or hail storm passes over. Data is organized and shared on the CoCoRaHS website, and used by scientists, farmers and more.

Search for stars with your computer

    Einstein@Home uses your computer's idle time to search for space signals. The project has already had major successes: Volunteers discovered about 50 stars, using data from Puerto Rico's Arecibo Observatory and Australia's Parkes Observatory. Einstein@Home also searches for gravitational-wave signals using data from NSF's Laser Interferometer Gravitational Wave Observatory.

Be part of a supercomputer

    To link all those home computers, Einstien@Home uses software called the Berkeley Open Infrastructure for Network Computing, better known as BOINC. The software choreographs(安排，筹划) the technical aspect of volunteer computing and helps you use radio telescope signals to search for alien life.

Join the plankton party

    Without plankton, life in the ocean would not exist. These tiny organisms form the base of the food chain, and play an important role in the global carbon cycle. Plankton Portal enlists citizen scientists to identify images of plankton, snapped by the In Situ Icthyoplankton Imaging System (ISIIS), an underwater robot engineered at the University of Miami. ISIIS has taken millions of images in oceans around the world and upload them into a database; classifying the images helps researchers understand plankton diversity, habitat and behavior.

    In his 402nd anniversary year, Shakespeare is still rightly celebrated as a great wordsmith （语言大师）and playwright （剧作家）.But he was not the only great master of dramatic writing to die in 1616, and he is certainly not the only writer to have left a lasting influence on theater.

    While less known worldwide, Tang Xianzu is considered China's greatest playwright and is highly spoken of in that country of ancient literary and dramatic traditions.

    Tang was born in 1550 in Linchuan, Jiangxi province, and pursued a low-key career as an official until, in 1598 and aged 49, he retired to focus on writing. Unlike Shakespeare's large body of plays, poems and sonnets （十四行诗），Tang wrote only four major plays: The Purple Hairpin （《紫钗记》），Peony Pavilion （《牡丹亭》），A Dream under the Southern Bough （《南柯记》），and Dream of Handan（《邯郸记》）. The Peony Pavilion is considered Tang's masterpiece. The latter three are constructed around a dream narrative, a device through which Tang unlocked the emotional dimension of human desires and ambitions and explored human nature beyond the social and political restrictions of that time.

    Tang lived toward the end of the Ming Dynasty（1368—1644）and the popularity of his works had a good reason. Similar to Shakespeare, his success rode the wave of a renaissance （复兴）in theater as an artistic practice. As in Shakespeare's England, Tang's works became hugely popular in China too. During Tang's China, the way, in which playlets were enjoyed and performed, changed. Kunqu opera, a form of musical drama, spread from southern China to the whole nation and became a symbol of Chinese culture. Combining northern tune and southern music, kunqu opera was known for its poetic language, music, dance movements and gestures. Tang's works benefited greatly from the popularity of kunqu opera, and his playlets are considered classics of kunqu opera.

    While Tang and Shakespeare lived in a world away from each other, there are many things they share in common, such as the humanity of their drama, their iconic and heroic figures, their love for poetic language, a lasting popularity and the anniversary during which we still celebrate them.

Earthquakes are something that people fear.There are some places that have few or no earthquakes.Most places in the world,however,have them regularly (有规律地).Countries that have a lot of earthquakes are usually quite mountainous.

The most talked about earthquake in the United States was in San Francisco in 1906.Over 700 people died in it.The strongest one in North America was in 1964.It happened in Alaska.

Strong earthquakes are not always the ones that kill the most people.In 1755,one of the strongest earthquakes ever recorded was felt in Portugal.Around 2,000 people died.

In 1923,a very strong earthquake hit Tokyo and the Yokohama areas of Japan.A hundred and forty thousand people died.Most of them died in fires which followed the earthquake.

One of the worst earthquakes ever was in China in 1976.It killed a large number of people.The worst earthquake ever reported was also in China,in which about 830,000 people were killed.This earthquake happened in 1556.

Earthquakes worry people a lot.The reason is that we often do not know when they are coming.People cannot prepare for it.