One Monday morning, I was waiting at the bus stop in Harvard Square. It was very cold, about -8℃. I just missed the bus, so I had to stand there on such a cold day, waiting for the next bus to go to the hospital. My mind was full of anxiety. "Why didn't I leave two minutes earlier?" "What would go wrong with my husband's operation (手术)?" "Will I get to him before it starts?"

    Among the others at the bus stop was a woman who was about 50 years old. She wore an old hat, an old pair of boots and a dark coat, but she had no gloves (手套). Another woman who looked younger came to the older woman and said, "Your hands must be very cold. You will get frostbite (生冻疮) in this weather if you don't wear gloves." With these words, she dropped her heavy bag to the ground. After a while, she took out a pair of purple gloves from her bag, took the older woman's hands and gently placed a glove on each hand. "Thank you. You're so kind." The old woman said again and again.

    I was deeply moved (感动) by this act of kindness. A moment ago, I was feeling sorry for myself, but now I felt hopeful and optimistic (乐观). I thought in this world there were still many people in trouble who were in great need of our help.

    A few days later, I went to buy 5 pairs of bright purple gloves in a shop and put them in my bag, just in case (以防) I might run into someone in need on a cold day.

    In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very simple camera (照相机).He put it in a window of his house and took a picture of his garden. That was the first photo.

    The next important date in the history of photography (摄影术) was in 1837. That year, Daguere, another Frenchman, took a picture of his reading room. He used a new kind of camera in a different way. In his picture you could see everything very clearly, even the smallest thing. This kind of photo was called a Daguerreotype.

    Soon, other people began to use Daguerre's way. Travelers brought back wonderful photos from all around the world. people took picture of famous buildings, cities and mountains.

    In about 1840, photography was developed. Then photographers could take picture of people and moving things. That was not simple. The photographers had to carry a lot of film and other machines. But this did not stop them, for example, some in the United States worked so hard.

    Mathew Brady was a famous American photographers. He took many picture of gread people. The picture were unusual because they were very lifelike(栩栩如生的).

    Photographers also became one kind of art by the end of the 19th century. Some photos were more just copies of the real world. They showed and feelings, like other kinds of art.