The poaching（偷猎）, or illegal killing, of rhinos(犀牛) in South Africa is growing worse each year．The government recently reported that a record number of rhinos were poached in 2015，a year which had more rhino killings in South Africa than ever before.

    The World Wildlife Fund，or WWF，says about 20, 000 rhinos live in South Africa．That is more than 80 percent of the rhinos in the world．Edna Molewa，South Africa's Environment Minister，says, “During 2015，we are sad to say this，1,215 rhinos were killed．This is a rise in the number of poached rhinos from 1,004 in 2014 and indeed very worrying.”

    The animals are hunted for their horns(角)．Many people in Asia believe the horn has curing power，which drives poachers， at all costs，mad for more horns． But there is no scientific evidence for this belief．The horn is made of keratin(角蛋白)．That is the same thing as human hair，fingernails and toenails.

    Ms．Molewa said 386 suspected poachers were arrested last year，an increase from the year before．But rhino protection workers say poachers often go unpunished after arrest． South Africa's legal system is ineffective． Ms． Mo1ewa said more needs to be done and South Africa is taking strong measures to protect rhinos．The efforts include moving some of the animals to secret places in neighboring countries. “Now approximately 100 rhinos have been moved to neighboring states in the SADC region during 2015 and 200 more rhinos will be moved this year,” Molewa said.

    Jo Shaw，the rhino program manager at the WWF，said， “We're talking about a loss of a hundred rhinos a month，or more than three a day．We really need to see effective action not just at a national level but internationally．” She says officials should find the criminal groups responsible for the poaching and punish them. Government officials are to meet in Botswana in March at the Inter-governmental Conference on Illegal Wildlife Trade.

    Are you looking for some new and exciting places to take your kids to? Try some of these places:

    Visit art museums. They offer a variety of activities to excite your kids'interest. Many offer workshops for making hand-made pieces, traveling exhibits, book signings(签名）by children's favorite writers, and even musical performances and other arts.

    Head to a natural history museum. This is where kids can discover the past from dinosaur models to rock collections and pictures of stars in the sky. Also, ask what kind of workshops and educational programs are prepared for kids and any special events that are coming up.

    Go to a Youtheater. Look for one in your area offering plays for children and family visitors. Pre-show play shops are conducted by area artists and educators where kids can discover the secret about performing arts. PuPPet (木 偶）making and stage make-up are just a couple of the special offerings you might find.

    Try hands-on science. Visit one of the many hands-on science museums around the Country • those science play-lands are great fun for kids and grown-ups alike. They will keep your child mentally and physically active the whole day through while pushing buttons, experimenting, and building. When everyone is tired, enjoy a fun family science show, commonly found in these museums.

    One of the questions surrounding climate change is how it might affect the food supply for a growing global population. A new study suggests that researchers have been overlooking how two key human responses to climate—how much land people choose to farm, and the number of crops they plant—will affect food production in the future. The new study focused on the Brazilian state of Mato Grosso, an emerging（新兴的）global breadbasket（产粮地区）that as of 2013 supplied 10 percent of the world's soybeans. The researchers used variations in temperature and precipitation（降水）across the state over an eight-year period to estimate the sensitivity of the region's agricultural production to climate change. Those historical comparisons can help in making predictions about the sensitivity of agriculture to future climate change.

    The study found that, if the patterns from 2002 to 2008 hold in the future, an increase in average temperature in Mato Grosso of just 1 degree will lead to a 9 to 13 percent reduction in overall production of soy and corn. “This is worrisome given that the temperature in the study region is predicted to rise by 2 degrees by 2050,” said Avery Cohn, who led the study.

    Most studies of this kind look only at the extent to which climate shocks affect crop output. But researchers can miss critical dynamics（动力）that can affect overall output, says Leah VanWey, one of the study's senior authors. “If you look at output alone, you're not looking at all of the information because there are economic and social changes going on as well,” said VanWey.

    If output decreases, farmers may put less land area into production because it's not profitable. Farmers may also vary the number of crops they plant in a growing season. Double cropping is common in Mato Grosso. But if the weather is bad, farmers may change their decision to plant a second crop.

Keeping secrets is a burden

    “Don't tell anyone”. We hear these words when someone tells a secret to us. But it can be hard to keep a secret. We're often tempted to “spill the beans(说漏嘴)”, even if we regret it later.

    According to Asim Shah, professor in the Menninger Department of Psychiatry and Behavioral Sciences at Baylor College of Medicine, US, keeping a secret may well “become a burden”. This is because people often have an “obsessive and anxious urge to share it with someone”.

    An earlier study, led by Anita E. Kelly, a scientist at the University of Notre Dame, US, suggested that keeping a secret could cause stress. People entrusted(受委托的) with secrets can suffer from depression, anxiety, and body aches, reported the Daily Mail.

    But with secrets so often getting out, why do people share them at all? Shah explained that people often feel that it will help them keep a person as a friend. Another reason people share secrets is guilt over keeping it from someone close to them. A sense of distrust can develop when people who are close do not share it with each other. “Keeping or sharing secrets often puts people in a position of either gaining or losing the trust of someone,” according to Shah.

    He added that talkative people could let secrets slip out (泄露).But this doesn't mean that it is a good idea only to share secrets with quiet people. A quiet person may be someone who keeps everything inside. To tell such a person a secret may cause them stress, and make them talk about the secret. Shah said that to judge whether to tell someone a secret.

    Shah said that to judge whether to tell someone a secret, you'd better put yourself in their position. Think about how you would feel to be told that you mustn't give the information away. Shah also recommended that if you accidentally give up someone's secret you should come clean about it. Let the person know that their secret isn't so secret anymore.

    Suppose you become a leader in an organization. It's very likely that you'll want to have volunteers to help with the organization's activities. To do so, it should help to understand why people undertake volunteer work and what keeps their interest in the work.

    Let's begin with the question of why people volunteer. Researchers have identified several factors that motivate people to get involved. For example, people volunteer to express personal values related to unselfishness, to expand their range of experiences, and to strengthen social relationships. If volunteer positions do not meet these needs, people may not wish to participate. To select volunteers, you may need to understand the motivations of the people you wish to attract.

    People also volunteer because they are required to do so. To increase levels of community service, some schools have launched compulsory volunteer programs. Unfortunately, these programs can shift people's wish of participation from an internal factor (e.g. "I volunteer because it's important to me") to an external factor (e.g. "I volunteer because I'm required to do so"). When that happens, people become less likely to volunteer in the future. People must be sensitive to this possibility when they make volunteer activities a must.

    Once people begin to volunteer, what leads them to remain in their positions over time? To answer this question, researchers have conducted follow-up studies in which they track volunteers over time. For instance, one study followed 238 volunteers in Florida over a year. One of the most important factors that influenced their satisfaction as volunteers was the amount of suffering they experienced in their volunteer positions. Although this result may not surprise you, it leads to important practical advice. The researchers note that attention should be given to "training methods that would prepare volunteers for troublesome situations or provide them with strategies for coping with the problem they do experience".

    Another study of 302 volunteers at hospitals in Chicago focused on individual differences in the degree to which people view "volunteer" as an important social role. It was assumed that those people for whom the role of volunteer was most part of their personal identity would also be most likely to continue volunteer work. Participants indicated the degree to which the social role mattered by responding to statements such as "Volunteering in Hospital is an important part of who I am." Consistent with the researchers' expectations, they found a positive correlation (正相关) between the strength of role identity and the length of time people continued to volunteer. These results, once again, lead to concrete advice: "Once an individual begins volunteering, continued efforts might focus on developing a volunteer role identity…Items like T-shirts that allow volunteers to be recognized publicly for their contributions can help strengthen role identity".

    The greatest recent changes have been in the lives of women. During the twentieth century there was an unusual shortening of the time of a woman's life which was spent in caring for children. A woman marrying at the end of the 19th century would possibly have been in her middle twenties. They would be likely(可能) to have seven or eight children and four or five of them lived till they were five years old. By the time the youngest was fifteen, the mother would have been in her early fifties and would expect to live a further twenty years. During the twenty years, chances and health made it unusual for her to get paid work.   

    Today women marry younger and have fewer children. Usually a woman's youngest child will be fifteen when she is forty five and is likely to take paid work until they are sixty. Even while she has to take care of children, her work becomes easier by eating fast foods and using washing machines , cleaning robots and so on.

    This important change in women's way of life has only recently begun to play a role in their position.   Even a few years ago most girls left school at the first chance and most of them took a full- time job. However, when they married, they usually left work at once and never returned to it. Today the school -leaving age is sixteen. Many girls stay at school after that age, and though women are likely to marry younger, more married women stay at work at least until their first child is born. Many people return to full or part-time work after that. Such changes have caused a new relationship in the family, with both the husband and the wife accepting a great share of the duties and satisfactions of family life, and with both the husband and the wife sharing more equally in supporting the family, according to the abilities and interests of each of them.