【推荐1】We love to stare into our smart devices. We gaze for hours at ourcomputers, smartphones, tablets and televisions.    1    It might be, mainly because as we stare at our devices we are exposing our- selves to blue light.

Blue light is a type of electromagnetic radiation (电磁辐射) with a very short wavelength that produces a high amount of energy. While it’s true that light can damage your eyes under certain circumstances, there’s no scientific evidence suggesting that blue light is harmful to our eyes.     2    Blue light exposure is nothing new. In fact, the sun is the largest source of blue light. Moreover,blue light is also present in fluorescent and LED light. But if blue light isn’t harmful, then why are we constantly rubbing our eyes when we’re looking at our screens?    3    More than 60 percent of people experience problems associated with digital eyestrain. And blue light, it seems,isn’t the cause. Instead, our eyes are so strained because most of us blink less when we stare at our digital devices.

    4     However, wearing them could potentially help you get a good night’s sleep. That’s because blue light, research has shown, affects your body’s circadian rhythm(生理节律),your natural wake and seep cycle. According to Harvard researchers,any kind of light-including blue light-can reduce your body’s ability to secrete melatonin (分泌褪黑激素), a hormone that helps you sleep.

    5    You can find them everywhere. You also can address your blue light exposure by changing your smart phone or tablet’s display settings to night shit or something similar, or you can down- load an app that filters out blue light, too.

【推荐2】People who give, live longer, studies have shown. Now, a new study by University of Michigan shows that why people volunteer—not whether they volunteer—is what really counts.

For the study, Konrath and colleagues analyzed data collected in 2008 and 2012 aiming at the same random samples of 3,376 people. Overall, they found that just 2.3 percent of those who once worked as volunteers had died, compared to 4.3 percent of non-volunteers. They further found that how much people volunteered mattered as well—only 1.8 percent of regular volunteers died, compared with 2.5 percent of occasional volunteers.

But what really made a difference were people’s motives for volunteering. The researchers asked people to rate how important they found various reasons for volunteering, and they found that the more important people rated reasons such as feeling pity for people in need, the more likely they were to be alive. Those who rated motives related to personal benefit as more important were more likely to have died, and just as likely to die as those who didn’t volunteer at all. These reasons included volunteering because they enjoyed the social contact, to escape their own problems, or to explore their own strengths.

Konrath says the current findings suggest it may be a poor idea to encourage people to volunteer because it’s good for them. “Volunteering is increasingly being encouraged in schools and organizations. Some groups say that it’s okay to want benefits for yourself, and encourage people to think of volunteering as an exchange for personal interests. Some groups emphasize the health benefits received through volunteering.” Konrath added, “Of course, it’s reasonable for volunteers to expect benefits for themselves. But the potential health benefits of volunteering are significantly reduced if self-benefit becomes a person’s main motive.”

【推荐3】Leap year

    1     It normally occurs every four years always on an even-numbered year. The extra day is added to our shortest month. That is the second month of the year, which in non-leap years has 28 days, two fewer than any other month. When you see Feb. 29 on a calendar, you know that year is a leap year.

Leap year is also called the bissextile year.     2     In our calendar system there is a need for a leap year because the solar year (the time it takes the earth to go around the sun once) is actually slightly more than 365 days long. That extra day-Feb. 29 every four years-helps correct the difference between our calendar and the solar calendar.     3    

Leap year was first made part of the calendar by the ancient Roman leader Julius Caesar. His astronomers had calculated the length of the solar year to be 365 days and six hours. So Caesar declared that an extra day be added to the calendar.

Caesar’s adjustment, however, was not entirely accurate because his astronomers’ year exceeded the true solar year by eleven minutes and fourteen seconds. By 1582, a difference of ten days had developed between the calendar year and the true solar year. To correct this error, Pope Gregory XIII ruled that every fourth year would continue to be a leap year except for century years that could not be divided evenly by 400.     4     This may seem complicated, but is works

Persons born on Feb. 29 celebrate their growing up a little differently from the rest of us.     5     But if they go strictly by the calendar, they have only one-fourth as many birthday celebrations as most people.

【推荐1】In today's world, most workers are highly specialized, but this specialization can come at a cost——especially for those on the wrong team. New research by Harvard's Growth Lab uncovers the importance of teams and coworkers when it comes to one's productivity, earning potential, and stays of employment. The research analyzed administrative data on the 9 million inhabitants of Sweden. It found that to earn high wages and returns on education, workers must find coworkers who complement, but not substitute them.

The research offers a tool to assess the right and wrong coworkers in fields of expertise. The right coworkers are those with sills you lack, yet needed to complete a team. The wrong coworkers are those who have the same skill set as you and eventually lower your value to the employer. For example, those with a degree in architecture are best assisted by workers with engineering, construction, or surveying degrees, and negatively impacted by those with landscape or interior design degrees.

“We tend to think of sills as something personal that individuals can market to a company, ” said Frank Neffke, Growth Lab Research Director “However, this vision of sills is too simplistic. One person's sills connect to another person's sills, etc. ,and the better these connections are, the more productive workers will be, and the more they will earn” Neffke adds that the benefits of working with complementary coworkers are not the same for all workers. Those with higher levels of education seem to benefit much more from working in complementary teams than workers with lower levels. Over the past 20 years, workers with college degrees or higher have been increasingly able to find better matching coworkers.

Complementary also drives careers. The research shows that people tend to stay longer in organizations with many complementary workers and tend to leave those with many workers who substitute them. These results hold true for up to 20 years of one's career.

The research also supports several well-known facts, such as cities and large firms pay higher wages. Workers are more likely to find better fitting teams in cities, and large firms often allow workers to specialize.

【推荐2】◆Protect the natural and cultural heritage. Don’t damage or deface any buildings，displays and other facilities. Take care of all plants. Put rubbish in the bins provided.

◆Take care when you are going up and down steps or stairs and when you are walking nearby the waters.

◆Please buy tickets before entering the scenic spot. One ticket is only for one person. Adult：＄60 per ticket. Children over 6 and under 18，half price. People over 60 and children under 6 are free.

◆If you are going into the wooded and hilly lands，for your own safety，please go with three people at least and don't take any tinder(易燃物）along with you. The hill is steep so please take care of yourself.

◆This scenic spot is the reserve of water source: No fishing，swimming，washing and any behaviors that are harmful to the water source. Meanwhile，please follow the management rules of the scenic spot conscientiously.

◆Opening time：From Monday to Friday，8：00 a. m.～18：00 p.m.；From Saturday to Sunday，6：00 a. m:一24：00 p. m.

◆Small animals such as rabbits，peacocks，squirrels，frogs must be taken care of: None of them shall be killed.

If you have any trouble in visiting our world natural park，please call 477一866一7044．Our staff will do our best to help you.