In 1905, as part of his Special Theory of Relativity, Albert Einstein published the point that a large amount of energy could be released from a small amount of matter. This was expressed by equation E = me 2(energy = mass times the speed of light squared). But bombs were not what Einstein had in mind when he published this equation.

    In 1929, he publicly declared that if a war broke out he would “refused to do war service, direct or indirect…” His position would change in 1933, as the result of Adolf Hitler's coming into power in Germany.

    Einstein's greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built because some physicists feared that Germany might be working on an atomic bomb. Among those concerned were physicists Leo Szilard and Eugene Wigner. But Szilard and Wigner had no influence with those in power. So in July 1939 they explained the problem to someone who did: Albert Einstein. After talking with Einstein, in August 1939 Szilard wrote a letter to President Roosevelt with Einstein's signature on it, which was delivered to Roosevelt in October 1939.

    Germany has invaded Poland the previous month; the time was ripe for action. That October research of a-bomb began but proceeded slowly because the invention of the atomic bomb seemed distant and unlikely. In April 1940 an Einstein letter, ghost-written by Szilard, pressed the researchers on the need for “greater speed”.

    As the realization of nuclear weapons grew near, Einstein looked beyond the current war to future problems that such weapons could bring. He wrote to his friend about his fear about the future use of the a-bomb.

    The atomic bombings of Japan occurred three months after Germany gave in.

In November 1954, five months before his death, Einstein summarized his feelings about his role in the creation of the atomic bomb: “I made one great mistake in my life… when I signed a letter to President Roosevelt recommending that atom bombs be made; but there was some justification—- the danger that the Germans would make them”.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

Note：

* All under 18's must be accompanied by an adult

* Pets allowed: No

* Cost: Free

* Phone: 01674­830736

* Location: SNH Visitor Centre, St Cyrus National Nature Reserve

    Not so long ago, most people didn't know who Shelly Ann Francis Pryce was going to become. She was just an average high school athlete. There was every indication that she was just another Jamaican teenager without much of a future. However, one person wants to change this. Stephen Francis observed then eighteen-year-old Shelly Ann as a track meet and was convinced that he had seen the beginning of true greatness. Her time were not exactly impressive, but even so, he seemed there was something trying to get out, something the other coaches had overlooked when they had assessed her and found her lacking. He decided to offer Shelly Ann a place in his very strict training seasons. Their cooperation quickly produced results, and a few year later at Jamaica's Olympic games in early 2008, Shelly Ann, who at that time only ranked number 70 in the world, beat Jamaica's unchallenged queen of the sprint(短跑).

    “Where did she come from?” asked an astonished sprinting world, before concluding that she must be one of those one-hit wonders that spring up from time to time, only to disappear again without signs. But Shelly Ann was to prove that she was anything but a one-hit wonder. At the Beijing Olympic she swept away any doubts about her ability to perform consistently by becoming the first Jamaican woman ever to win the 100 meters Olympic gold. She did it again one year on at the World Championship in Briton, becoming world champion with a time of 10.73—the fourth record ever.

    Shelly-Ann is a little woman with a big smile. She has a mental toughness that did not come about by chance. Her journey to becoming the fastest woman on earth has been anything but smooth and effortless. She grew up in one of Jamaica's toughest inner-city communities known as Waterhouse, where she lived in a one-room apartment, sleeping four in a bed with her mother and two brothers. Waterhouse, one of the poorest communities in Jamaica, is a really violent and overpopulated place. Several of Shelly-Ann's friends and family were caught up in the killings; one of her cousins was shot dead only a few streets away from where she lived. Sometimes her family didn't have enough to eat. She ran at the school championships barefooted because she couldn't afford shoes. Her mother Maxime, one of a family of fourteen, had been an athlete herself as a young girl but, like so many other girls in Waterhouse, had to stop after she had her first baby. Maxime's early entry into the adult world with its responsibilities gave her the determination to ensure that her kids would not end up in Waterhouse's roundabout of poverty. One of the first things Maxime used to do with Shelly-Ann was taking her to the track, and she was ready to sacrifice everything.

    It didn't take long for Shelly-Ann to realize that sports could be her way out of Waterhouse. On a summer evening in Beijing in 2008, all those long, hard hours of work and commitment finally bore fruit. The barefoot kid who just a few years previously had been living in poverty, surrounded by criminals and violence, had written a new chapter in the history of sports.

    But Shelly-Ann's victory was far greater than that. The night she won Olympic gold in Beijing, the routine murders in Waterhouse and the drug wars in the neighboring streets stopped. The dark cloud above one of the world's toughest criminal neighborhoods simply disappeared for a few days. “I have so much fire burning for my country,” Shelly said. She plans to start a foundation for homeless children and wants to build a community centre in Waterhouse. She hopes to inspire the Jamaicans to lay down their weapons. She intends to fight to make it a woman's as well as a man's world.

    As Muhammad Ali puts it, “Champions aren't made in gyms. Champions are made from something they have deep inside them. A desire, a dream, a vision.” One of the things Shelly-Ann can be proud of is her understanding of this truth.

    When people find themselves in difficult conflicts, they often turn to mediation(调解). Mediator are advised to listen attentively, avoid favoring the ideas of one party, and make both sides feel at ease. Surprisingly, new research that my colleagues and I conducted shows that, to effectively help people settle their conflicts, mediators should adopt a hostile(敌对的) attitude rather- than a calming one. A hostile mediator, we find, brings better results than a nice one

    Why would adding more negativity to an already hostile situation prove beneficial? Consider how parents typically react when they can't get their children to stop quarreling: "I don't care who started it, both of you, go to your rooms!" At first sight, a calm mediator seems likely to be more effective. But as anyone with brothers or sisters knows, parents' seemingly unsympathetic treatment of the situation can have an unusual effect,

    In our research, we created situations in which pairs of negotiators were part of a heated conflict. In some cases, the mediator had a "nice" approach-calm and polite. In others, he was hostile-aggressive and somewhat rude. Across different types of conflicts, we found that negotiators were more willing and able to reach an agreement in the presence of a hostile mediator than in the presence of a nice one.

The main result of the test is not that hostility pays off. In fact, recent research has documented the social costs of negative behavior. For example, being the target of rude behavior reduces people's performance on a variety of tasks. Other research shows the social benefits of positive behavior. People are more likely to close deals and become future business partners.

    Even with the widespread social benefits of positive behavior and costs of negative behavior, hostility can pay off in certain situations.

    Scientists recently discovered three tyrannosaur (霸王龙) trackways in Canada. The trackways suggest the meat eaters traveled and hunted in groups. The 70-million-year- old footprints are the first tyrannosaur trackways ever found.

    Tyrannosaurs were a type of meat-eating dinosaur that included the strong Tyrannosaurus rex and Albertosaurus. “Groups of tyrannosaurs may have stuck together as a group to increase their chances of bringing down animals and individually surviving,” study coauthor Richard McCrea says. He works for Canada's Peace Region Paleontology Research Centre. It's believed that tyrannosaurs were solitary creatures. The newly discovered trackways could change the way scientists look at these frightening beasts.

    Trackways can uncover a lot about the social behavior of a species. Unfortunately, very few tyrannosaur footprints have ever been found, and until recently, the only ones known were single prints discovered in Mongolia, the western U.S., and western Canada. But in October 2011, a hunting guide named Aaron Fredlund found two tyrannosaur track marks near Tumbler Ridge, an area in the foothills of the Canadian Rockies. Over the next year, McCrea and his team searched the site and found the remaining trackways.

    The footprints are at about the same depth, which suggests the tyrannosaurs moved through the area at the same time. Impressions of the dinosaurs' rough skin are even visible in the prints. The prints are also in near-perfect condition. That's because the ground had a high clay (黏土 ) content when the dinosaurs walked through the area. The land was later covered by a thick layer of volcanic ash, which kept the marks intact (完整). "This is the most ideal situation you could ask for," McCrea says.

    Researchers aren't sure of the exact species of tyrannosaur that left the prints. But the historic findings show a great deal about how the beasts moved and behaved. “We have extremely convincing evidence that tyrannosaurs traveled in groups,” says McCrea. "This is probably the most important evidence to come out to date on that topic."

    I was driving my newly acquired motorcycle across the vastness of North Dakota when all of the sudden it froze up on the road. I would later be told the belt had slipped and this caused one of the pistons(活塞)to break a cylinder(气缸)head, or something like that.

    Anyway, I sat on the side of the road for what seemed like hours. I even pretended to have been in an accident, which didn't help. Finally, a young man pulled over and offered me a ride, but given that he already had two motorcycles in the back of his truck, he could only take me.

    He drove me to the next town, where I asked to be dropped off Rather than drop me off, he waited while I asked around if anyone could help me to pick up my motorcycle. One elderly gentleman was working and said that I could use his pickup! Can you imagine that a stranger gave me the keys to his pick up. It was quite an experience, I must say. So, as I drove back 20 miles to get my motorcycle, the gentleman who first stopped to help me followed me. We both put the motorcycle in the back of the truck and then I followed him another 50 miles or so and we both unloaded the motorcycle at his place. Then, he followed me back to the small town so I could return the man's truck. I didn't have much cash on me, maybe $40, but I gave it to the man for the use of his truck.

    Two strangers helped rescue me from spending the night on the side of the road in ND. I don't recall their names, but when I close my eyes I can see their faces as if it were yesterday. Thank you, strangers. You may be reading this right now.