Childhood is a happy time, right? Not necessarily. Consider these facts.

Depression(抑郁症) may occur in as many as 1 in 33 children.

    Once a child has an episode of depression, he or she has a 50 percent chance of experiencing another episode in the next 5 years.

    Suicide(自杀) is the 6th leading cause of death for 5-to-15-year-olds.

    If your child experiences 5 or more of these signs or symptoms for at least 2 weeks, he or she may be experiencing depression or mental illness.

    Sometimes, a child who causes problems at school or at home may actually be depressed, according to the American Academy of Child and Adolescent Psychiatry.

    If you think your child may be depressed, it's important to have your child treated. Discuss your child's problems with his or her doctor. The doctor may suggest a referral to a children's psychologist or psychiatrist.

    We often just use our sense of sight, touch, smell, and taste to eat food. But what about our sense of hearing? Does sound also affect our dining experience?

    A new report answers, “yes, it does.”

    That answer comes from researchers at Brigham Young University and Colorado State University in the United States. They found that hearing is important in the eating experience.

    Hearing is often called “the forgotten food sense”, says Ryan Elder. Elder is an assistant professor of marketing at Brigham Young University's Marriott School of Management. He says that if people notice the sound the food makes as they eat it, they might eat less. On the other hand, watching loud television or listening to loud music while eating can hide such noises. And this could lead to overeating.

    For the study, the researchers wanted to test whether the sounds of eating—chewing, chomping and crunching—had any effect on how much a person ate. During the experiments, the test subjects wore headphones and listened to noise at either a high or low audio level. Then researchers gave them a crunchy snack: pretzels. The study found that subjects who listened to the higher volume noise ate more pretzels than those with the low audio levels.

    Elder says that when hiding I heard sounds of eating, like when you watch television or listen to loud music while eating, we take away the sense of hearing. And this may cause you to eat more than you would normally. The researchers are calling this, the “crunch effect”.

    The researchers admit that the effects may not seem like much at one meal. But over a week, a month or a year, all that food can really add up.

    "Be proud of what you do"(对你所做的感到骄傲), my father always told me, "whether you are a boss （老板）or a cleaner", When I was 15, I got a summer job in a hospital, I was told that my duties would include sweeping floors. I smiled and remembered Dad's words. Even though my job was the lowest, it made me feel excited. I saw it as a challenge because it was my first job. I learned to be on time and tried to do everything well. In return(作为回报), I was treated with respect（尊重） by doctors, nurses and patients. Each morning I imagined that the dirty dishes would make patients more sick if I were not there to wash them clean. After breakfast was done, I started sweeping the floors of all patient rooms and cleaning toilets. Though I was tired, I wanted the job to be done well, people would say, "That young boy really does a good job." That gave me a pride. Working in the hospital taught me that being proud of one's job is important. It does not matter whether the job is sweeping floors or managing a large business. Though every job I have ever had, my father's words have always stayed with me, I have swept floors, and I have been a manager（经理）. I think Dad would be proud of me!

    I've worked part time since taking early retirement ten years ago. I was inspired by an older friend. We worked for the same company, and he retired two years before I was also considered “spare”, as some companies call it.

    Soon after I left work, we had lunch together. First, he assured me that there was life after work. Then he related his own experience. He didn't want to take another full-time job, so he turned his daughter's old bedroom into a home office. He arranged for some consulting work from our old company, and he picked up more projects from other contacts. Soon he was working 20 to 30 hours a week. He wasn't making as much money. His kids were grown-up, so he didn't need as much income. “As soon as I left that job,” he told me, “my back problems went away. I started to eat better and get more exercise, I make half as much money, but I feel twice as good, and I'm twice as happy.”

    I decided to follow a similar track. At the time, my younger child almost finished college, so my parental responsibilities were winding down. We sold our old house and moved into a townhouse. I went to work for myself. And the result? Today I, too, make less money. But we make ends meet. And I feel twice as good and twice as happy.

    Our experience isn't for everybody. But a lot of people have retired early and lived to tell the tale, which proves it possible. Jack, another friend, was a salesman for a communication firm. He had a long distance to work and did a lot of traveling. He decided to leave the corporate world, in part because he had health problems and he wanted to spend more time with his family. Later, he quit his job with flexible hours and was restored to his health. And now he has found a part-time job, and he, together with his family, is leading a more relaxing life.

    Being an astronaut sounds cool, doesn't it? In space, they get to do some pretty amazing things, like floating (漂浮) in zero gravity(重力).

    However, there are also plenty of things that astronauts can't do because of their weightless environment(环境), and that's very sad. What's worse, they can't even let their sadness show -because it's impossible to cry in zero gravity.

    Of course, astronauts can still produce tears. But crying is much more difficult in space, reported The Atlantic in January. Without gravity；tears don't flow downward out of the eyes like they do here on Earth. This means that when you cry in space, your tears have nowhere to go — they just stick to your eyes.

    In May 2011, astronaut Andrew Feustel experienced this during one of his spacewalks. "Tears," he said, "don't fall off your eye...They just kind of stay there."

    Besides making your vision(视觉) unclear, this can also cause physical pain. Back on Earth, tears are supposed to bring comfort to the eyes. But that's not the case in space. The space environment dries out astronauts' eyes, and when tears suddenly wet the eyes, it can cause pain rather than comfort. "My right eye is painful like crazy." Feustel told his teammate during the walk.

    Since gravity doesn't work in space, astronauts need some extra help to get rid of the tears. Feustel chose to rub his eyes against his helmet to wipe the tears away. Another choice is to just wait — "When the tears get big enough they simply break free of the eye and float around," astronaut Ron Parise told The Atlantic.

    There are lots of small things — things like crying — that we are so used to on Earth, we usually take them for granted, until they become a problem in a totally different environment, like space. There, astronauts can't talk to each other directly. They also can't eat or drink in normal ways. They can't even burp (打嗝), because there is no gravity to hold the food down in their stomach. If they do burp, they just end up throwing up (呕吐) everything in their stomach, according to the UK National Space Center.

    Thus, perhaps it's only space explorers who can honestly say, "Gravity, you're the best."

Deforestation in tropical(热带的) regions of Asia, Africa and the Americas has reduced the cooling effects of trees. "The temperature change associated with deforestation over the 15-year study period is equal to a century of global warming, happening almost instantly, at these locations," says Luke Parsons at Duke University in North Carolina.

Now, by using data from population surveys and mapping tree cover loss over a 15-year period, Parsons and his colleagues have estimated the effect of deforestation on outdoor workers across 41 countries. He says climate change has already pushed tropical locations right to the edge of what would be considered safe for heavy outdoor labour and that deforestation causes those locations to be even more precarious.

Parsons and his colleagues used land surface temperature measurements from satellites, and collected humidity(湿度) data, to estimate how hot an average day felt to outdoor workers in regions which either lost or maintained tree cover between 2003 and 2018. "The study focuses on what you would think of as a 'feels-like' temperature. It takes into account how well you can cool yourself by sweating, which is affected by humidity, as well as the temperature," says Parsons.

The researchers then turned to population surveys to estimate the number of outdoor workers in these areas. This revealed that some 2.5 million outdoor workers in Asia lost at least half an hour of safe work per day, between 2003 and 2018, due to increased temperatures in deforested regions. Nearly 200,000 outdoor workers in the Americas and some 31,000 people in Africa lost this amount of safe work time each day. Regions that maintained forest cover generally stayed cool, and less work time was lost.

It is important to remember that, due to the scale(规模) of the study, the team didn't measure actual worker hours on the ground across the entire tropics, says Parsons. This means the assessment of lost worker hours is based on theoretical considerations rather than direct observations of behaviour.