There are 115 distinct (独特的) species of pine trees with 35 native to North America. Pines are defined as evergreens with long, needle-like leaves and are only native to the northern hemisphere. Pine trees are an adaptable and tough species that can survive in many conditions where other plants cannot. The average pine tree is 45 to 60 feet tall, but some are nearly twice as high.

Western White Pine

    The western white pine grows the tallest of any pine tree, reaching up to 110 feet in height. They have blue-green needles arranged in bundles (束) of five and produce a long cone (球果).

Bristlecone Pine

    The bristlecone pine grows slowly, reaching about 20 feet tall. It is one of the oldest species of pine.

Mexican Pine

    The Mexican pine can grow to 50 feet tall, with long, slender needles that drape (下垂) off it like a weeping willow (柳树). Often nicknamed the “willow pine”, it is native to Mexico. Its leaves can droop up to 12 inches long.

Sugar Pine

    The sugar pine is another of the large pine species, such as the bull pine, but it also has the largest cones of any pine species, at 10 to 20 inches long. It grows from Oregon to California and is often used for construction.

Jack Pine

    The jack pine is one of the smallest species of pine with rare leaves. Compared with the pines mentioned above, it doesn't seem to belong in the family. It is considered a member of the scrub-pine family; it prefers sandy soil.

    Beauty has always been regarded as something praiseworthy. Almost everyone thinks attractive people are happier and healthier, have better marriages and have more respectable jobs. Personal advisors give them better advice for finding jobs. Even judges are softer on attractive defendants. But in the executive(主管) circle, beauty can become a liability.

    While attractiveness is a positive factor for a man on his way up the executive ladder, it is harmful to a woman.

    Handsome male executives were considered as having more honesty than plainer men; effort and ability were thought to lead to their success.

    Attractive female executives were considered to have less honesty than unattractive ones; their success was connected not with ability but with factors such as luck.

    All unattractive women executives were thought to have more honesty and to be more capable than the attractive female executives. Interestingly, though, the rise of the unattractive overnight success was connected more to personal relationships and less to ability than that of the attractive overnight success.

    Why are attractive women not thought to be able? An attractive woman is considered to be more feminine and an attractive man more manly than the less attractive ones. Thus, an attractive woman has an advantage in traditionally female jobs, but an attractive woman in a traditionally manly position appears to lack the "manly" qualities required.

    This is true even in politics. "When the only clue is how he or she looks, people treat men and women differently," says Anne Bowman, who recently published a study on the effects of attractiveness on political candidates. She asked 125 undergraduate students to rank two groups of photographs, one of men and one of women, in order of attractiveness. Then the students were told the photographs were of candidates for political offices. They were asked to rank them again, in the order they would vote for them.

    The results showed that attractive males completely defeated unattractive men, but the women who had ranked most attractive unchangeably received the fewest votes.

    US Space Agency Returns to Mars with InSight Lander

    The American space agency's lander InSight is to arrive on Mars at the end of November, 2018. Unlike NASA's Curiosity rover, InSight will not move across the planet's surface. Instead it will become the first spacecraft (航天器) used only for exploring underground. It will study the geography of Mars, searching for signs of Martian (火星的) quakes.

    InSight is a project of U.S. and Europe. It is 6 meters long and 1.5 meters wide. It weighs 360kilograms. InSight's 1 .8 -meter robotic arm will put two experiments in place. Both are designed toexplore underground of Mars to learn about the inside.

    Bruce Banerdt is the lead scientist for InSight. He viewed the spacecraft as a robot that can take care of itself. "It's got its own brain. It's got an arm. It can listen and feel things. It pulls its own power out of the sun," he noted.

    Thomas Zurbuchen, one of the heads in NASA, said the results of the InSight project could "change the way we think about the inside of our earth." But, first, InSight will have to land on Mars undamaged. Since Mars exploration started in the 1960s, only about 40 percent of the explorations have succeeded.

    Tom Hoffman is InSight's project manager. He said earlier successes do not lessen the concerns for each new exploration. "That we ve done it before doesn't mean we're not nervous and excited about doing it again," he said.

    InSight will enter the Martian atmosphere (大气层) traveling at 19,800 kilometers an hour. It will slow for landing on a wide flat area on Mars. If all goes well, InSight could carry out its experiments in about 10 weeks. The InSight project is expected to continue for one Martian year, about two years on Earth.

    If it had not been for Fan Jinshi and her team, the world cultural heritage at Dunhuang Mogao Grottoes in a remote Chinese desert might have long been destroyed by sand, weather or humans.

    Born and raised in Shanghai, Fan has spent half a century fighting an uphill battle to preserve the ancient Buddhist wall painting at Dunhuang, in Northwest China's Gansu Province. The 1,651-year-old Dunhuang Mogao Grottoes are a huge collection of Buddhist art—more than 2,000 buddha figures and 45,000 square meters of paintings spread among 735 caves. It is China's first UNESCO World Heritage Site.

    Archaeologist Fan was sent to Dunhuang after graduation from Peking University in 1963. While in Dunhuang, a remote village in the desert then, Fan lived in an abandoned temple. At first, she did not even dare to go out to the toilet at night. To protect the treasures from sand and dampness, Fan and other workers put doors on the caves, planted trees and started monitoring temperature and humidity in the caves. They also controlled the number of visitors.

    In the late 1990s, with tourism booming nationwide since national holidays were extended, the local government planned to go public with Dunhuang Mogao Grottoes, but found Fan firmly in their way. “The heritage would have been destroyed if it had been listed,” she said.

    Dunhuang Academy has now photographed and cataloged online all the sculptures and paintings. “Despite our efforts to minimize damage, we can't completely stop them from being eroded. But the digital database will last.”

    Fan was grateful when her husband joined her in Dunhuang in 1986 after 19 years of separation. Her two sons grew up in Shanghai with their aunt.  “I have not been a good mother or wife. With regard to my family, I'm full of guilt,” she said. Fan, 79, retired two years ago as the director of Dunhuang Academy but continues her efforts as a national political adviser.

    As anyone who freelances(做自由职业) knows, there are lots of advantages of working at home alone. But there are drawbacks too, like the potential loneliness. No wonder co-working spaces are becoming so popular: they permit self-employed individuals to feel like they are part of all office environment, while making them get some work done too. But renting a co-working space does cost money.

    Now a Swedish project is aiming to change that by turning people's under-used homes into temporary co-working spaces, available to freelancers for free. Hoffice was started by freelancers Christofer Gradin Franzen and Johline Zandra about a year ago in Stockholm when they invited a few people into their home office to work together. It was a great success, and the project has since spread to a number of cities in Europe, North and South America, Australia, India and Japan. Anyone can sign up and offer their home space as a free co-working space, or go to find a Hoffice near them.

    On a Hoffice day, everyone arrives and starts work at a certain hour. After 45 minutes, everyone gets up to take a break, stretch, do qigong or yoga for 10 to 15 minutes. Afterwards, people can gather around again, and restate their intentions and goals for the rest of the workday, as a way to motivate each other. Meals can be eaten together at a certain hour, potluck-style(家常饭) or by bringing your own lunch.

    This process creates an encouraging and supportive work environment. As some freelancers describe,“By working at Hoffice, we give ourselves and each other the gift to spend our days in a social working environment, where we are extremely productive without ignoring our other human needs. We also make sure to give us and each other what we need to feel calm, happy, inspired and creative during the working day.”

    So Hoffice is not just about sharing space; it's also about a free exchange of ideas. And perhaps the best thing is that Hoffices are free to use.

    Do you still use a power button(开机键)to open your smart phones or computers? You are out of fashion! Now most smart phones are using facial-recognition system(面部识别系统), and we already have machines that can know you from your fingers and your voice too. But some companies are still willing to invent other systems to "break" these systems, for example, the eye-recognition system. As is reported, you'll just have to look at the computers and machines, and this system will be able to tell you who you are by looking at your eyes, even when you are wearing glasses.

    Do you wonder if this system will work well? The answer is YES. All you need is just look at your machines. The eye scanner(扫描仪)is put in the cameras of your machines. The eye-recognition system is safer and easier than other systems. This is because everyone's eyes are different. Since the system works easily, you won't have to remember a group of code when you want to open your computer or take money out of a bank in the future. Eye-recognition system is better than other kinds of systems because your eyes don't change as you get older, and don't get dirty like hands or fingers. Even twins' eyes are not the same. So the eye-recognition system can be up to 94 percent correct, but it depends on how good the technology is. Some systems may only 51% right. In Britain, it was found that 91 percent of the people who had tried it said that they liked the idea of eye-recognition. So scientists think it will become more popular than other systems.

    The eye-recognition system has already been tested in shops in the USA, Britain, Spain, Italy and Turkey Soon it will become a popular way among public. In the future, your computer will be opened by looking at your eyes.