Maybe it is true that we do not know what we have got until we lose it,but it is also true that we do not know what we have been missing until it arrives.

    It takes an hour to like someone,and a day to love someone,but it takes a lifetime to forget someone.Giving someone all your love is never an assurance that they will love you back.Do not expect love in return;but if it does not,be content it has grown in yours.Do not rely on one's appearance;it can trick you.Do not rely on wealth;even that fades away.Rely on someone who makes you smile,because it takes only a smile to make a dark day seem bright.

    There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them.Dream what you want to dream;go where you want to go;be what you want to be,because you have only one life and one chance to do all the things you want to do.

    The brightest future will always be based on a forgotten past.You cannot go on well in life until you let your past failures and heartaches go off.May you have enough happiness to make you sweet,enough trails to make you strong,enough sorrow to keep you human,enough hope to make you happy.The happiest of people do not necessarily have the best of everything;they just make the most of everything that comes along their way.Happiness waits for those who cry,those appreciate the importance of people who have touched their lives.Always put yourself in others' shoes.If you feel that it hurts you,it probably hurts the other person,too.

    When you were born,you were crying and everyone around you was smiling.Live your life so that when you die, you are the one who is smiling and everyone around you is crying.

    Being physically active three times a week reduces the odds of being depressed by about 16%, according to new UCL research carried out as part of the Public Health Research Centre.

    The study, published in JAMA Psychiatry, found a two-way relationship between depression and physical activity. People who increased their weekly activity were reported to have fewer depressive symptoms but those with more depressive symptoms were less active, particularly at younger ages.

    Researchers followed 11,135 people born in 1958 up until the age of 50, recording depressive symptoms and levels of physical activity at regular intervals in adulthood. They found that each additional activity period per week reduced odds of depression by 6%. In England 19% of men and 26% of women are currently classed as "inactive", and this study suggests that activity could significantly improve their mental as well as physical health.

    "Assuming the association is causal, physical activity has a protective effect against depression. If an adult between his twenties and forties who isn't physically active became active 3 times per week, he would reduce his risks of depression by about 16%," said Dr Snehal of the UCL Institute of Child Health, lead author of the study.

    Professor Mark，Director of the Public Health Research Centre, said: "Many people are already aware of the benefits of physical activity on their general health, but now we are seeing more evidence that suggests it also has a positive effect on a person's mental well-being. The latest research highlights just how important it is to ensure that people are working and living in environments that allow them to be both physically active and mentally healthy."

    Climate change is perhaps the key issue of our time. Often, however, it is presented to us as being so abstract that it seems impossibly distant. For those of you looking for something a little more concrete, a new report suggests that the effects of climate change may significantly affect coffee.

    The report, put out by The Climate Institute, describes the effects of climate change on various coffee-growing nations and the resultant effects on the plants and those who grow them.

    Coffee Arabica plants, which produce 70% of all commercial coffee, can be adversely affected by even a half-degree change in typical weather conditions. This sensitivity to temperature puts the plant at increased risk of the effects of climate change.

    In Central America the average temperature has risen by a full degree Celsius since 1960. In Ethiopia the average temperature has increased by 1. 3 degrees. This increase is enough to have notable effects on the plants. In Tanzania the productivity per hectare of coffee has fallen by half since the 1960s due to changes in temperature.

    Indeed, studies claim that by 2050 the area of the world suitable for growing coffee will be cut by half. Coffee production is likely to then be pushed to higher elevations (海拔) to take advantage of lower temperatures, but this will not be enough to make up for lost lowland areas.

    Coffee is the second most traded goods by developing nations, and the inability of producer nations to export it could cause dramatic chain reactions in their economies. Millions of people make a living in the production, processing, transport, and sale of coffee; their livelihoods would stand to take a blow as growing areas decrease and prices rise.

    As the temperature keeps rising, your cup of coffee will become much more expensive, and it may also carry an aftertaste bitterer than usual, for all those workers in the coffee belt left without the means to make a living as conditions worsen. Not only that, but the economic effects will cost the West millions in increased foreign aid.

    Moving smoothly and silently through Alibaba Group Holding Ltd's futuristic "FlyZoo" hotel, black disc-shaped robots about a metre in height deliver food and drop off fresh towels.

    The robots are part of a set of high-tech tools that Alibaba says strongly cuts the hotel's cost of human labour and eliminates the need for guests to interact with other people.

    Formally opened to the public last month, the 290-room FlyZoo is an incubator for technology Alibaba wants to sell to the hotel industry in the future and an opportunity to showcase its prowess in artificial intelligence. It is also an experiment that tests consumer comfort levels with unmanned commerce in China.

    Inside the hotel, softly-lit white panelled walls bring to mind the interiors of Hollywood spaceships. Guests check in at podiums that scan their faces, as well as passports or other ID. Visitors with a Chinese national ID can scan their faces using their smartphones to check in ahead of time.

    Elevators scan guests' faces again to verify which floor they can access and hotel room doors are opened with another face scan.

    "It's very quick and safe. I haven't used it much yet, but basically, I can be in my room in one minute, "said guest Tracy Li. Li added that safety was one of her priorities and she was pleased her room could only be entered with a scan of her face.

    In the rooms, Alibaba's voice command technology is used to change the temperature, close the curtains, adjust the lighting and order room service.

    At the hotel's restaurant, taller capsule-shaped robots deliver food that guests have ordered via the FlyZoo app while at a separate bar, a large robotic arm can mix more than 20 different types of cocktails. Facial recognition cameras add charges to the room rate automatically.

    The hotel does employ humans, though Alibaba declined to detail how many. This includes chefs and cleaners as well as reception staff, who will assist with conventional check-in procedures for guests unwilling to have their faces scanned and want to use electronic key cards.

Summer Programs for Teens

University of Maryland: TERP Young Scholars

    This program is the perfect summer camp for academically talented teenagers who want to pursue academic interests, explore career opportunities, and discover college life at the University of Maryland.

    During three weeks of intellectual exploration, teens can study with students who share similar interests, and communicate with some of the university's best teachers. Upon successful completion, students can earn three college credits.

Carpe Diem: The University-bound Adventure

    Carpe Diem supports both American and international students in applying to a university by providing private consultation. This 2-week experience also includes tours of famous East Const universities Students will also have the opportunity to build their resumes (简历) by working with writing experts.

    Great Books Summer Program

    This is a lively, warm and welcoming summer camp community of outstanding teens, who love literature and ideas. In the past eleven years, it has gathered middle and high school students from across the world to read selections from the greatest works of literature, experience heated discussions and enjoy summer camp fun with other literary-minded students. Participants can gain confidence in their ability to read a text closely and express their ideas clearly both verbally and in writing.

Zeal Travel

    We offer our teens two week and three- week long trips to Hawaii, Alaska, Australia and Spain. All trips include 15-25 hours of community service activities.

    Depending on your trip of choice, you'll be helping Hawaiians protect their forest ecosystem, caring for dogs in Spain, working with Habitat for Humanity, and much more. Every trip also includes exciting outdoor activities like surfing, driving, ice-climbing, hiking and more. The possibilities are endless and there is a zeal trip for every interest.

Blameless

    I was a freshman in college when I met the Whites. They were completely different from my own family, yet I felt at home with them immediately. Jane White and I became friends at school, and her family welcomed me like a long-lost cousin.

    In my family, it was always important to place blame when anything bad happened.

    "Who did this?" my mother would scream about a dirty kitchen.

    "This is all your fault, Katharine," my father would insist when the cat got out or the dishwasher broke.

    From the time we were little, my sister, brothers and I told on each other. We set a place for blame at the dinner table.

    But the Whites didn't worry about who had done what. They picked up the pieces and moved on with their lives. The beauty of this was driven home to me the summer Jane died.

    In July, the White sisters and I decided to take a car trip from their home in Florida to New York. The two older sisters, Sarah and Jane, were college students, and the youngest, Amy, had recently turned sixteen. Proud of having a new driver's license, Amy was excited about practicing her driving on the trip. She showed off her license to everyone she met.

    The big sisters shared the driving of Sarah's new car during the first part of the trip, but when they reached less crowded areas, they let Amy take over. Somewhere in South Carolina, we pulled off the highway to eat. After lunch, Amy got behind the wheel. She came to a crossroads with a stop sign. Whether she was nervous or just didn't see the sign no one would ever know, but Amy continued into the crossroads without stopping. The driver of a large truck, unable to stop in time, ran into our car.

    Jane was killed immediately.

    I was slightly injured. The most difficult thing that I've ever done was to call the Whites to tell them about the accident and that Jane had died. Painful as it was for me to lose a good friend, I knew that it was far worse for them to lose a child.

    When Mr. and Mrs. White arrived at the hospital, they found their two daughters sharing a room. Sarah had a few cuts on the head; Amy's leg was broken. They hugged us all and cried tears of sadness and of joy at seeing their daughters. They wiped away the girls' tears and made a few jokes at Amy as she learned to use her crutches(拐杖).

    To both of their daughters, and especially to Amy, over and over they simply said, "We're so glad that you're alive."

    I was astonished. No blame. No accusations.

    Later, I asked the Whites why they never talked about the fact that Amy was driving and had run a stop sign.

    Mrs. White said, "Jane's gone, and we miss her terribly. Nothing we say or do will ever bring her back. But Amy has her whole life ahead of her. How can she lead a full and happy life if she feels we blame her for her sister's death? "

    They were right. Amy graduated from the University of California and got married several years ago. She works as a teacher of learning-disabled students. She's also a mother of two little girls of her own, the oldest named Jane.