For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive （善于接受的） to such messages.

    Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100 light years of earth. In addition, they will scan (扫视) the entire sky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.

    Of the 200 billion stars in the Milky Way galaxy （银河星系）, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life. Based on the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.

    However, many scientists wonder whether intelligent （有智力的） life exists on other planets. Some believe that twenty years of searching without any intelligible （可理解的） messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.

    Other scientists believe that our search hasn't been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family in only about five billion years old,  our galaxy is about 20 billions years old. In that time, some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.

    When I told my father that I was moving to Des Moines, Iowa, he told me about the only time he had been there. It was in the 1930s, when he was an editor of the literary magazine of Southern Methodist University（SMU）in Dallas, Texas. He also worked as a professor at SMU, and there was a girl student in his class who suffered from a serious back disease. She couldn't afford the operation because her family was poor.

    Her mother ran a boardinghouse in Galveston, a seaside town near Houston, Texas. She was cleaning out the attic（阁楼）one day when she came across an old dusty manuscript（手稿）. On its top page were the words, “By O. Henry”. It was a nice story, and she sent it to her daughter at SMU, who showed it to my father. My father had never read the story before, but it sounded like O. Henry, and he knew that O. Henry had once lived in Houston. So it was possible that the famous author had gone to the beach and stayed in the Galveston boardinghouse, and had written the story there and left the manuscript behind by accident. My father visited an O. Henry expert at Columbia University in New York, whoauthenticatedthe story as O. Henry's.

My father then set out to sell it. Eventfully, he found himself in Des Moines, meeting with Gardner Cowles, a top editor at the Des Moines Register. Cowles loves the story and bought it on the spot. My father took the money to the girl. It was just enough for her to have the operation she so desperately needed.

My father never told me what the O. Henry story was about. But I doubt that it could have been better than his own story.

    Nancy Wake was born in New Zealand, in 1912. The family moved to Australia in 1914 and after being educated in Sydney, she travelled to Europe where she worked as a journalist. In Nazi (纳粹的) Germany she saw the rise of Adolf Hitler and Anti-Semitism. On one occasion in Vienna she witnessed Jews being whipped by members of the Sturm Abteilung (SA). In 1939 Nancy married the wealthy French industrialist, Henri Fiocca, in Marseilles. Nancy was in France when the German Army invaded in May 1940. After the French government surrendered, Nancy joined the French Resistance. She worked with Ian Garrow's group helping British airmen shot down over France to escape back to Britain.

    In December 1940 the network was betrayed and Nancy was forced to go into hiding. She continued to work for the French Resistance and was eventually arrested while in Toulouse. However, the authorities did not realize they had captured the woman known as the “White Mouse” and she was set free after four days.

    It was now too dangerous to remain in occupied France and Nancy crossed the Pyrenees into Spain before travelling to Britain. She now joined the Special Operations Executive (SOE) and agreed to become a British special agent (特工).

On 29th April 1944, Nancy was parachuted into the Auvergne region of France. Her main aim was to locate local soldiers and to provide them with some guns that were being dropped by parachute by the Royal Air Force four times a week.

Nancy had the task of helping the resistance to prepare for the armed uprising that was due to coincide with the D-Day landings. She also led an attack against the Gestapo headquarters in Mountucon and a German gun factory. Henri Tardivat, one of her comrades in the resistance later said that: “She is the most feminine woman I know, until the fighting starts. Then she is like five men.”

    After the war, Nancy worked for the Intelligence Department at the British Air Ministry. In 1960 she married John Forward and returned to Australia to live.

Do you like spicy food?

    What's your opinion on spicy food? Some people cannot handle even the smallest amount of chili-red pepper-in their dinner while others can't get enough of it.

    Scientists have long been puzzled by why some people love chili while others loathe it. Plenty of research has been done on the subject, dating as far back as the 1970s. Previous results showed that a love of chili is related to childhood experiences, and cultural influences affect our taste buds too. But the latest study has found that a person's love of spicy food may be linked to his or her personality more than anything else, CBC News reported.

    "We have always assumed that liking drives intake-we eat what we like and we like what we eat. But no one has actually directly bothered to connect these personality traits with intake of chili peppers,"said Professor John Hayes from Pennsylvania State University, who led the study.

    But before you look at the study, you should first know that "spicy" is not a taste, unlike sour, sweet, bitter and salty. It is, in fact, a burning sensation that you feel on the surface of your tongue. This got scientists thinking that maybe a love of spicy food is brought about by people's longing for thrill, something they usually get from watching action movies or riding a roller coaster.

    In the study, 97 participants, both male and female, were asked to fill out questionnaires about certain traits of their personality, for example, whether they like new experiences or tend to avoid risks. They were then given a glass of water with capsaicin, the plant chemical that makes a chili burn, mixed into it.

    By comparing the answers to the questionnaire and what participants said they felt about the spicy water, researchers found that those who tended to enjoy action movies or take risks were about six times more likely to enjoy the spicy water.

    Interestingly, we used to believe that the reason some people can withstand spicy food is that their tongues have become less sensitive to it. However, this latest study has found otherwise. "It's not that it doesn't burn as badly, it's that you actually learn to like the burn," Hayes explained.

    How much weight a baby gains during its first month could determine its IQ, new research found. The study found that children who gain more weight, and whose heads grow quickly during the first month of life, tend to have a higher IQ when they start school.

    Researchers at the University of Adelaide, in Australia studied 13, 800 children who were born at full-term. They found that those who put on 40% of their birth weight in the first four weeks had an IQ 1.5 points higher than those who only put on 15% of their birth weight. Those who experienced the biggest growth in head circumference(头围) also had the highest IQs by the age of six.

    "Head circumference is an indicator of brain volume, so a greater increase in head circumference in a newly-born baby suggests more rapid brain growth, "says the author of the study, Dr. Lisa Smithers. She added, "Overall, newly-born children who grew faster in the first four weeks had higher IQ scores later in life. Those children who gained the most weight scored especially high on the verbal IQ at age 6. This may be because neural (神经的) structures for the verbal IQ develop earlier in life, which means the rapid weight gain during the first month could be having a direct cognitive benefit for the children."

    Previous studies have shown the association between early postnatal (产后的) diet and the IQ, but this is the first study of its kind to focus on the IQ benefits of rapid weight gain in the first month of life. Dr. Lisa Smithers says the study further highlights the need for successful feeding of newly-born babies." We know that many mothers have difficulty establishing breastfeeding in the first week of their babies' life,” Dr. Lisa Smithers said.

    "The findings of our study suggest that if babies are having feeding problems, there needs to be early intervention(干预) in the management of that feeding."

    Philadelphia offers a ton of attractions that are suitable for people of every age and here are some family—friendly attractions.

    Spruce Street Harbor Park

    Spruce Street Harbor Park, one of the best urban beaches in America, is an outdoor heaven on the Delaware River waterfront. Visitors can relax in a hammock, play on the playgrounds, and play games like table tennis and giant chess. Don't miss out on the park at night, when colorful LED lights hanging from treetops make the entire area bright.

    Blue Cross River Rink

    Offering ice skating in the winter and roller skating in the summer, Blue Cross River Rink creates a fun, outdoor experience for the whole family. Visitors can play on the nine-hole mini-golf course during the summer, and enjoy eats and drinks from the on-site bar and restaurant all year round.

    Sesame Place

    Big Bird, Elmo and the other stars of Sesame Street come out and play at Sesame Place, the only theme park in the nation starring the popular TV show's most lovable characters. A water park, interactive activities, parades, fireworks and shows add to the fun.

    Once Upon a Nation Storytelling Benches

    On summer days, uniformed and professional storytellers at 13 storytelling benches throughout Philadelphia's Historic District entertain visitors with true, free, three-to-five minute tales about the colonial era as part of Once Upon a Nation. Children can pick up a Story Flag at any storytelling bench, and then collect a star from every storyteller on their journeys. Flags with all the stars can get free rides on the Parx Liberty Carousel at Franklin Square.