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A

       You probably know who Marie Curie was, but you may not have heard of Rachel Carson.Of the outstanding ladies listed below, who do you think was the most important woman of the past 100 years?

 Jane Addams(1860-1935)

Anyone who has ever been helped by a social worker has Jane Addams to thank. Addans helped the poor and worked for peace. She encouraged a sense of community(社区)by creating shelters and promoting education and services for people in need In 1931,Addams became the first American woman to win the Nobel Peace Prize.

  Rachel Carson(1907-1964)

If it weren't for Rachel Carson, the environmental movement might not exist today. Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the world's lakes and oceans.

Sandra Day O'Connor(1930-present)

When Sandra Day O'Connor finished third in her class at Stanford Law School, in 1952,she could not find work at a law firm because she was a woman. She became an Arizona state senator(参议员) and ,in 1981, the first woman to join the U.S. Supreme Court. O'Connor gave the deciding vote in many important cases during her 24 years on the top court.

  Rosa Parks(1913-2005)

On December 1,1955,in Montgomery, Alabama,Rasa Parks would not give up her seat on a bus to a passenger. Her simple act landed Parks in prison. But it also set off the Montgmery bus boycott. It lasted for more than a year, and kicked off the civil-rights movement. “The only tired I was, was tired of giving in,” said Parks.

    What if our babies could somehow tell us what they're thinking about, what they want, and what makes them unhappy? Robyn Holt, researcher for Baby Talk New Zealand, says they can. Holt heard about baby sign language through an advertisement and decided to go along to a workshop (研讨会).

    “Sign language is something that's always interested me, and I thought, it could be really cool to try this with a baby because we are always guessing all the time what they actually want.”

    Holt started using baby sign language with her baby son Benjamin, now 12, and within two weeks he started to sign the sign for milk. She has since used it with her two younger sons Dominic, 8, and Matthew, 3.

    Baby sign language is nothing new: the practice (which is based on adult sign language) has been out in America for more than 30 years. But it is enjoying a rebirth in New Zealand.

    The idea behind baby sign language is that babies do have the ability to communicate their needs if they are given the right tools to do so. Although many mothers develop an intuition (直觉) about whether their baby's crying is from hunger, tiredness, or pain, baby sign language creates a direct form of communication that unlocks the mystery.

    When babies are between 6-months and 12 to 13-months, parents can begin to teach them sign language: use the sign for milk while feeding, and also talk about milk, so that the child begins to make the link (关联) in their brain. Then they can begin to add other signs, i.e. food, sick or pain.

    “I know of one parent. Her child was signing the sign for hurt by his mouth, and she realised his first teeth were growing. It makes life so much easier,” said Holt.

    When the dog named Judy spotted the first sheep in her life, she did what comes naturally. The four-year-old dog set off racing after the sheep across several fields and, being a city animal, lost both her sheep and her sense of direction. Then she ran along the edge of cliff( 悬崖) and fell 100 feet, bouncing off a rock into the sea.

    Her owner Mike Holden panicked and celled the coastguard of Cornwall, who turned up in seconds. Six volunteers slid down the cliff with the help of a rope but gave up all hope of finding her alive after a 90-minute search.

    Three days later, a hurricane hit the coast near Cornwall. Mr. Holden returned home from his holiday upset and convinced his pet was dead. He comforted himself with the thought she had died in the most beautiful part of the country.

    For the next two weeks, the Holdens were heartbroken. Then, one day, the phone rang and Steve Tregear, the coastguard of Cornwall, asked Holder if he would like his dog bark.

    A birdwatcher, armed with a telescope, found the pet sitting desperately on a rock. While he sounded the alarm, a student from Leeds climbed down the cliff to collect Judy.

    The dog had initially been knocked unconscious(失去知觉的)but had survived by drinking water from a fresh scream at the base of the cliff. She may have fed on the body of a sheep which had also fallen over the edge. “The dog was very thin and hungry,” Steve Tregear said, “It was a very dog. She survived because of a plentiful supply of fresh water,” he added.

    It was, as Mr. Holden admitted, “a minor miracle(奇迹)”.

    Every day, a homeowner in Pennsylvania is reminded of a mistake he made 13 years ago. At around 8 in the evening, his peaceful house comes alive with the noise of an alarm clock he dropped into the wall over ten years ago. It's been stuck in the wall ever since.

    13 years ago, Jerry Lynn wanted to make a hole through his living room wall, so he could pass the television cable (电缆)through it. He didn't want to destroy any pipes in the wall, so he came up with a good idea to make sure that he was drilling(钻孔) in an empty place. He took his alarm clock, tied it to a string(线) and set it to go off in 10 minutes. Then he lowered it into the wall, and waited for it to ring. His goal was to drill a hole in a safe place near the place where the ringing was coming from, making sure that there was nothing to pass through there. It all went smoothly until the alarm clock fell into the wall.

The man didn't get back the alarm clock, but thought it would probably run out of battery(电池)in several months, so he wasn't too worried about it. But 13 years later, the alarm clock still rings every day.

    As you can imagine, Jerry and his wife have gotten used to the ringing living room wall, but it can still surprise  guests. So Jerry decides to pull down that wall, just to stop that boring thing, though after putting up with it for 13 years, he think it will be a pity. He says, “I've never herd of a clock battery lasting that long and my friends think it may be interesting to see how long it will keep ringing for.”

    The city of San Francisco is a wonderful tourist attraction that offers many different things to see and do. The best way for a traveler to get a good look at the city is to take one of the many different tours there.

    Tour the City on Foot

    When touring the city by walking, you aren't going to walk much. What's more, there are far more benefits. This kind of tour allows you to see as many buildings of the city as possible. A tour of the city on foot usually focuses on a more localized neighborhood level, which can be very interesting in a number of different ways.

    Hit the Waters of San Francisco Bay

    The waters of San Francisco Bay have played an important role in the city s development over the last century, Touring San Francisco from the water is a completely unique way for you to see this wonderful city.

    Take a Bus Tour

    If you want to see a wide variety of attractions from all over the city, one of the best things you could do is to book a tour through our company that offers services here. A bus tour of San Francisco is one of the most complete ways to experience the city

    Tour San Francisco from the Air

    While it is one of the most expensive ways to see San Francisco, touring the city from the air is one of the most unique and thrilling ways to see the city. Seeing the city from high above allows you to get a full view of the city as tour guides point out attractions from high above. If you do decide to tour San Francisco by air, you'll be creating memories that you won't forget forever.

    We are a travel agency providing high-quality services and discounts. For more information, please click here.

    Ever since mobile phones became widely used around the world, there have been concerns about how safe they are. All mobile phones give off a small amount of radiation when in use, which many believe could be a cause of cancer. However, two recently published studies tried to finally answer the question of whether using mobile phones actually brings a dangerous risk to humans.

    Carried out by the US government, the studies exposed rats and mice to radiation over the course of two years. A small number of the rats were found to have developed heart tumors (肿瘤) as a direct result of the radiation exposure. However, John Bucher, one of the study's authors, said that the animals were exposed to far more radiation than even the heaviest mobile phone user would usually be, reported The New York Times. Bucher also added that the findings didn't make him want to change his or his family's mobile phone usage habits.

    Indeed, the US Food and Drug Administration said it believes that it has “not found enough evidence that there are negative health effects on humans” from mobile phone use. Although mobile phones do give off radiation, it's a different type of radiation than that given off by dangerous sources.

    High-energy radiation – such as that given off by nuclear waste – is known to be very dangerous to humans as it is able to damage our DNA, leading to cancer or even death. On the other hand, low-energy radiation – such as the one given off by mobile phones – is considered to be harmless.

    We're exposed to this all the time, as it's given off by everyday objects like WiFi routers (路由器), televisions, and even bananas. Some argue that when it comes to human health, however, you can't be more concerned, even if the risk is only small. For those people, an earphone is advised when they are making phone calls and the time spent using mobile phones can be limited.

    But don't worry: there's no need to take bananas off the menu.