Scientists have been interested for years in the observation that ratios(比率）of finger lengths differ in men and women. In men, the ring (fourth) finger is usually longer than the index (second); their so-called 2D :4D ratio is lower than 1. In females, the two fingers are more likely to be the same length. Because of this sex differences, some scientists believe that a low ratio could be a marker for higher prenatal hormone(产前激素）levels, although it's not clear how the hormone might influence finger development. The 2D : 4D ratio has also been fingered in connection with brain-related characteristics—most often in males--such as depression, left-handedness, musical ability, and homosexuality.

    In the latest such study, psychologist Mark Brosnan and colleagues at the University of Bath in the United Kingdom photocopied the hands of 74 boys and girls aged 6 and 7.They compared the measurements of the second and fourth fingers with the children's scores on a standard UK test of math and literacy. In boys, the lower the ratio, the better their math score, the team reports in the May issue of the British Journal of Psychology, The boys with the lowest ratios also were the ones whose abilities were most skewed in the direction of math rather than literacy. These differences are small but significant, says Brosnan. With the girls, there was no correlation between finger ration and numeracy, but those with higher ratios—probably indicating low hormone levels—had better scores on verbal abilities.

    These sex-specific correlations show how tricky it is to define the roles of sex hormones, says psychologist S .Marc Breedlove of Michigan State University in East Lansing. The range of normal levels of the hormone is different in males and females, so comparable levels would have very different meanings depending on the sex of the individual. And the timing of hormone surges is as important as levels.

    Nevertheless, Brosnan believes finger measurements might be useful for predicting cognitive abilities—although he acknowledges that “we are not suggesting that finger length measurements could replace SAT tests”. Others are more cautious, pointing out that scientists still have not confirmed that finger ratio is a reliable marker for prenatal hormone levels.

    Venom (毒液) from a local scorpion (蝎子) in Cuba is being used by Cuban scientists as an effective weapon to fight cancer. The venom, with stopping pain, anti-inflammatory (炎症) and anti-cancer properties, is the active ingredient in the medicine “Vidatox 30 CH,” which can be used to treat liver, brain, lung and other cancers. The treatment has been successfully used for more than four years in humans after being first tested in biological models. Labiofam, a Cuban laboratory, has breeding (繁殖) centers for both the Red Scorpion and Blue Scorpion. Each month, some 30,000 scorpions in Las Minas town, 270 km east of Havana are made to give the venom. After two years, the scorpions are released back into their natural habitat.

    Denyer Sanchez, a biologist from Labiofam, explained that the conditions are adjusted for reproduction, proved by the high number of breeding female scorpions. He said when the offspring (后代) becomes able to live in the environment, we release them because they do not have the necessary size yet to remove their venom, said Sanchez. Sanchez also said that there is still much to research on the exploitation process of scorpions, such as female death rate or the ability to survive of the released scorpions.

    Cuban research on the scorpion's venom began at the end of 1980s in Guantanamo province, the island's eastern tip, where a group of biologists and doctors became interested in the stories told by the peasants about the venom's benefits. However, the first discovery was made by Cuban biologist Misael Bordier. In 2001, Bordier visited Mexico's National Autonomous University (UNAM) and presented the research progress in a professional journal. Bordier died in 2005, one year before Cuba's Industrial Property Office gave Labiofam the rights to exploit the patent related to the venom.

    Movies are a great means of entertainment for many. There are some advantages of watching movies. Comedies, for example, help reduce your blood pressure. Laughter for 15 minutes during a film makes your blood vessels (血管) wider. Besides, when you watch a sad movie, you're more likely to come away from it thinking about loved ones and feeling happy about what you have.

    Watching movies can make you creative. A study shows that young children, who watched the use of magic in Harry Potter, score significantly higher in a creative thinking test than children who watched something else. Moreover, movies are very useful for strengthening people's mental health. They enable people to take time to really relax and temporarily forget about their daily concerns and problems.

    However, watching movies aren't always beneficial. Studies have shown that some people get real pleasure out of being scared by horror movies, but in various ways they may be risking their physical and mental health without even knowing it. When you watch a tense scene in a movie, your heart rate and blood pressure increase. Meanwhile this change in your brain chemistry reminds you of times when you were in a similar state, even if you have no idea you even had those memories. So if something horrible happens to you, being scared again by a movie can unintentionally make you experience it once more.

    Scientists, politicians and parents have debated for decades if being exposed to movie violence leads to actual real-life violence. Overall the answer to that is probably still up in the air, but a new study seems to prove that watching aggression on screen can contribute to being a bully (土霸) in real life, even if it is just in the short term.

    In conclusion, certain movies play a positive role, but not all movies do. It depends completely on the subject of the movie. So it's always advisable to choose the movies concerning something positive.

    In many situations, the quality of your travel experience is directly affected by your ability to understand the local language. For some travelers, the challenge of learning a new tongue is one of the joys of travel, and as a result, they spend much of their time in conversations with local citizens. Others will find that just learning to read the most common signs and use every-day greetings is enough.

    No matter which view you agree with, it's necessary to take some time to learn some of the simple phrases of the new language before you go. One way of finishing this task is by listening to the new language. A phrase book can help expand your vocabulary, but hearing the sounds of the different spoken words is an excellent activity that can be done right in the comfort of your home. You can see movies in the new language or listen to the tapes or CDs. You can also download some listening material from the Internet. Just spending 15 minutes a night will improve your language skills.

    When you arrive in the new land, begin by greeting new friends in their own tongue. This may come easy or it could take some time to learn, but it's interesting. If you can't do this, then it means that you will need more practice and patience to learn these very important words. You can go out during the day and begin one-on-one conversations with shop owners, business-men and taxi drivers. This should not be done until you have learned some of the most common phrases, but once you begin to go shopping in a second language your communication skills will start to improve rapidly. You can also watch the local TV or listen to the local radio. For example, the advertisements will help you recognize the correct pronunciation of local street names.

    Columbus made four voyages to the west between 1492 and 1504 in his vain（徒劳的）search for a sea route to Asia. The mystery of why he failed to find it haunted（萦绕心头的,耿耿于怀的） him and filled him with sadness.

    Wherever he went to Cuba（古巴）,Puerto Rico（波多黎各）,Jamaica（牙买加）,South America, Panama（巴拿马）,down the coast of Central America—it was always the same story. Instead of golden palaces, there were grass huts and palm-leaf tents. Instead of silk-robed merchant princes, he found "Indians" who did not have so much as a shirt on their backs.

    When Columbus explored the West Indies in 1493,he heard tales of a fierce Indian tribe（凶狠的印第安部落） who literally devoured（吞食） its defeated enemies after a battle. These people were called by many names in the area, including Calina, Canima, Carib, and Caniba. Columbus recorded the name of the American natives as Canibales in Spanish, a word which came to refer, within a few years, to any eater of human flesh（食人部落,食人族）.In the similar fashion, the word Caribbean, a title for the sea as well as for the region, came into English.

    At times Columbus knew that this new land was not China, not Japan, not the Spice Islands. He seemed to accept it as a part of the earth that the geographers of Europe had never heard of before. It was another world—and he called it exactly that—but Columbus also insisted until he died that land he had reached was an unknown part of Asia.

    He has been called France's youngest leader since Napoleon Bonaparte. Emmanuel Macron, age 39, swept to victory in France's second-round of presidential election which was held on May 7, 2017. He defeated Marine Le Pen by a large margin of 62% of votes. He was inaugurated (就职) as President.

    Both of Macron's parents were doctors, and he attended one of the most prestigious (有声望的) schools in France, Lycee Henri Ⅳ. From there, he became an investment banker and economy minister. Unlike the other presidential candidates, he has always worked outside of the government.

    In April 2016, he created his own political movement, called En Marche! (On the Move!), recruiting (招募) more than 20,000 members. His party's ideals were neither right-or left-winged, but more independent. As his party became more and more successful, Macron began to think about presidency, something he'd always been interested in. In November 2016, he announced his decision to run in the 2017 election.

    Macron's campaign relied on his political movement. He struggled to win votes from both parties in France, as well as from the working class. In addition, he was the only candidate that was pro-EU, or supportive of European Union.

    While in office, Macron's biggest focus will be on improving the economy. A total of €50 billion will be dedicated to job training and creating green and sustainable energy. Macron also plans to cut down on corporate taxes, improve the public education system, and lower the unemployment rate by 2.7%.

    Following the election is the selection of the president's cabinet (内阁). The Prime Minister position was given to Edouard Philippe, mayor of Northern Le Havre. However, Macrons cabinet is surprising—one France has never seen before: a gender-balanced cabinet. Out of the 22 seats available, 11 will be taken by women and 11 will be filled by men. This percentage is much higher than other European countries.

    With each change of leadership come new ideals and changes to the country. Macron needs a parliament (议会) that will support his hopes and dreams for the future of France.