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    Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation.

    Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

    At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They can grow into cancer. Sometimes this does not show up for many years.

    This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated(辐射)and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents.

    Radiation can hurt us. We must know the truth.

    This is not a diet. It's a simple way to lose weight. You don't have to give up the food you love or join a gym. You just follow some habits thin people have. Keep them, and you'll become thin.

    Wake-up When you wake up in the morning, sit up slowly without using your hands. With legs straight out, lean forward(前俯) until you feel sore(酸痛的) in your back. It will use up 10 calories.

    Start with soup Order a clear soup, and have it before the main food. In this way, you'll feel fuller, so you'll eat less when the main food comes.

    An apple or more a day Apples are full of fiber(纤维) and water, so your stomach will want less. Studies show that people who eat at least three apples or pears a day may lose weight.

    Talk it up Every time you use the cell phone, stand up and walk around. Heavy people sit on average two and a half hours more each day than thin people. This skill is very important as standing up and walking around will burn up 50 or more calories.

    Use these skills, and you will have a big weight loss.

    A mixture of deep sorrow and anger has swept Brazilians across the country — particularly in the city of Rio de Janeiro — with the burning of their beloved Museu Nacional, or National Museum.

    By Monday morning, when I visited the site, the firemen were busy trying to enter the huge, early 19th-century neoclassical building. For all we know, everything may have been burned to ashes. Fortunately, no one, not even the four security guards who witnessed the beginning of the fire, has been injured.

    Nobody yet knows the cause of the fire, but it is the officials' irresponsibility and the funding shortages in particular, which are being blamed for this tragedy.

    Some of the museum's researchers told the press that they had been able to save some things from the exhibition rooms before the fire moved in. However, we Brazilians have lost much of the material memory of our short past. A good part of our 518 years of history, or that which had been transformed into storable objects, disappeared in just a few hours.

    The people of Rio de Janeiro were fond of taking their children  or grandchildren to the museum to show off their knowledge of the odd-looking mummies brought in from Egypt by the Emperor Dom Pedro II, a huge skeleton of a humpback whale, or the brightly coloured feathers of a headdress of the Kayapo tribe.

    When I think that I can no longer take my youngest daughter to the Museu Nacional — that is what gets me emotional. It is this feeling that has penetrated (穿透) our souls and may leave Brazilians feeling empty for a long time to come.

    Forty-three years ago, a man took a "small step" on the moon and brought mankind a "giant leap" forward. As the first person to walk on the moon, American astronaut Neil Armstrong is a man whose name will be remembered for generations to come.

    But being the first is never easy. With so many unknowns about space at that time, Armstrong himself was astonished that Apollo 11 actually worked. He thought he and his partners had merely a 50 percent chance of a successful landing back in 1969.

    It was tough indeed. When the module (登月舱) was approaching the moon's surface, the computer wanted to rest them on a steep slope covered with rocks, but Armstrong realized it was an unsafe place to stop.

    As a last minute decision, he safely landed the module by himself. When they finally touched the ground, "there was something like 20 seconds of fuel left," he said in an interview earlier this year.

    Unfortunately, some people doubted his visit to the moon, saying it was faked. But Armstrong responded with a chuckle (轻声笑), saying: "It was never a concern to me because I knew one day, somebody was going to go fly back up there and pick up that camera I left."

    For all his global fame, Neil Armstrong is a remarkably modest man. He rarely gave interviews and didn't like talking about his achievement. He stopped giving his signatures when he found that people sold them for thousands of dollars.

    "I guess we all like to be recognized not for one piece of fireworks but for the ledger (记账簿) of our daily work," Armstrong said in a CBS interview in 2005. When asked how he felt knowing his footprints would be likely to stay on the moon's surface for thousands of years, he said: "I kind of hope that somebody goes up there one of these days and cleans them up."

    Armstrong passed away last month at the age of 82, but he will be memorized. "The next time you walk outside on a clear night and see the moon smiling down at you, think of Neil Armstrong and give him a wink (眨眼示意)," his family said to Reuters.

    136 Crestview Circle

    Dover, Connecticut

    January 16, 2015

    Gander's Furniture Store

    Stamford, Connecticut, 09876

    Dear Sir,

    I am writing about your January bill, which I am returning with this letter. I am not going to pay this bill. Last month I bought a table and four chairs for $65.50. They were sent to me on December 18. That night one leg of the table broke while my wife was putting our dinner on it. It fell on one of the chair, and that broke, too. Our $ 2.50 steak landed on the floor, and the dog ate it.

    I spoke to the salesmen who had sold me the table and the chairs. He told me to write you a letter. I wrote you on December 20, saying that I was not going to pay for the furniture. On December 21 some men came and took it back to the store.

    Please do something about your records. I do not want to receive another bill for the furniture which I returned.

Yours truly,

Alberts Robbins