You get anxious if there's no wi-fi in the hotel or mobile phone signal up the mountain. You feel upset if your phone is getting low on power and you secretly worry things will go wrong at work if you're not there. All these can be called “always on” stress caused by smart phone addiction.

    For some people, smart phones have set them free from the nine-to-five work. Flexible working has given them more control over their working lives and enabled them to spend more time with their friends and families. For many others though, smart phones have become cruel masters in their pockets, never allowing them to turn them off and relax.

    Pittsburgh-based developer Kevin Holesh was worried about how much he was ignoring his family and friends in favor of his iPhone. So he developed an app — Moment — to monitor his usage. The app enables users to see how much time they're spending on the device and set up warnings if the usage limits are broken. “Moment's goal is to promote balance in your life,” his website explains. “Some time on your phone, some time off it enjoying your loving family and friends around you.”

    Dr. Christine Grant, an occupational psychologist at Coventry University, said, “The effects of this ‘always on' culture are that your mind is never resting, and you're not giving your body time to recover, so you're always stressed. And the more tired and stressed we get, the more mistakes we make. Physical and mental health can suffer.”

    And as the number of connected smart phones is increasing, so is the amount of data. This is leading to a sort of decision paralysis (瘫痪) and is creating more stress in the workplace because people have to receive a broader range of data and communications which are often difficult to manage. “It actually makes it more difficult to make decisions and many do less because they're controlled by it all and feel they can never escape the office,” said Dr. Christine Grant.

    Everyone knows that if a dog's ears are up and its tail is wagging vigorously, it is definitely pleased to see you. but now scientists using a robot have found that the way dogs use their tails is more complicated than we thought, and that dogs which wag them to the left may he more friendly. The animal psychologists discovered that when real dogs approached a life-sized robot dog, they were less cautious about it when it was wagging its tail to the left, while if it was wagging its tail to the right, far fewer dogs approached it in a confident manner.

    In the first experiments, 56 percent of the animals approached the model without hesitation when the tail was wagged to the left, while only 21 percent did so in the other situation. When the researchers excluded (排除) owners from being present, the result were: 31 percent of the dogs approached continuously when the tail was wagging to the left, while only 18 percent did so when it was on the right.

    Animal psychologist Roger Mugford said it added to the growing evidence that does were even more complicated communicators than the animals more closely related to man such as monkeys. He said, “We know that dogs, in a sense, have languages, but it is more complicated because it is not just them wagging their tails, but also giving out chemical displays.”

    He adds, “The research confirms earlier studies suggesting that dogs, like humans, had a left-side preference. If you are going to present a signal to a dog, it is sensible to put it on your left-hand side because that is where dogs, unlike most other animals, tend to look. It is another example of the similarity between dogs and humans. They are a lot more human than we give them credit for.”

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    The American Academy of Pediatrics (AAP) (儿科学) just released its updated guidelines for children's media use.

    The recommendations reflect what all parents know: children need less screen time, which indicates that they desperately need more free time to develop their imagination, a sense of wonder and discover their passion and purpose.

    Our children are over-stimulated, over-scheduled and under pressure to perform academically and beyond school. This weakens their ability to build creative thinking skills essential to self-discovery. Creativity occurs when kids have time for curiosity and exploration. With children spending up to eight hours a day on media devices and additional hours engaging in scheduled activities, opportunities for growth disappear.

    What we are not so sure about is how to get our kids to want the free, screenless time which we know will benefit them. It may sound counter-intuitive (违背直觉的) but today's kids need coaching to experience and discover the benefits of free time.

What came to parents easily a few decades ago has become a challenge for our generation. It's not that yesterday's parents knew more about child development; they simply had fewer choices. Boredom and relaxation were an inescapable part of daily life. Today, they mean, "I'm a bad parent and not doing enough to get my kid ahead."

    Recently, I had an eye-opening revelation while watching my 11-year-old daughter play in a softball game. I have six children and have attended dozens of such game. I know the drill—or thought I did. Families settled in for the day with lawn chairs, cold drinks and cousins. These brothers and sisters would gradually chat with each other. Games of catch and hide-and-seek began, and friendships were formed then. At crucial moments, the newfound friends turned their attention to the field to cheer on their teams.

    But that wasn't happening. Though there were at least 15 children by the sidelines (球场边线), I didn't hear any of them. They sat in silence using their individual tablets (平板电脑). Even with the score tied in the final inning (垒球比赛的一局), not a single child watched the game or spoke to each other. The situation was strange and revealing: Kids have more planned activities and passive entertainment at their fingertips than ever before, but less free time to dream, imagine and focus on what they truly love.

I understand that making time for "nothing" is difficult in a world where we are constantly worried our kids will fall behind if they aren't good at academics. But I refuse to sit back and watch this loss of childhood. We are taking back childhood. Imagination needs time and space to blossom.

If your kids are like mine, asking them to imagine will at the beginning be difficult. That's because they haven't developed the skills and muscle memory to make it second nature. I hope the AAP guidelines prompt all of us to set needed screen time limits for our children. Personally, I am practicing strategies to "develop imagination" in my children. Imagination, like a sport, requires practice, training, motivational speeches, rewards and extreme patience.

    Most high school students would rather spend their summer vacations far away from the classroom. But Vineet Kosaraju and Nikhil Cheerla are choosing to go back to school, and this time they are the teachers.

    "I think it's really nice that I can help the community by spending just a little bit of time every week helping just a few students here and there try and learn programming," Kosaraju said.

    Friends since they were young boys, Kosaraju and Cheerla always shared a love of computer science. They learned the skills from their parents and school, but recognized that not all children have that chance.

    "Programming isn't taught in that many schools, especially low income (收入) schools, because there isn't that much money to support it," Kosaraju said.

    So he and Cheerla developed "Math and Coding," an after-school program for kids of all ages to learn the basics of computer programming.

    Between applying for college and doing their own homework, the two boys now spend a few hours every week going to different libraries teaching classes that cover everything from building basic games to developing apps.

    The friends started the program a little over a year ago and already, it's spread to more than a dozen libraries across the Bay Area in California. They are even training volunteers to teach these very same classes in other US states and Canada.

    Maryann Mitchell brought her 8-year-old granddaughter, Gabriella, to a class on coding at the Alum Rock Library in San Jose, California.

    "It's a chance for her to learn," Mitchell said. "It's the way of the future, and it's a good way for her to get grounded and be ready for what the future holds."

    "I think the most rewarding thing is having people come up and thank you and say they really learned a lot from this class," Cheerla said. "It doesn't get any better than that."

    My son Leon's passion for surfing began at the age of 13. After school each day, he put on his wet suit, paddled out beyond the surf line and waited to be challenged by his companions.

    One afternoon, the lifeguard reported over the phone to my husband Wilson that Leon's eye was badly injured by his board. Wilson rushed him to the emergency room. He received 26 stitches (缝针) from the corner of his eye to the bridge of his nose.

    I was on an airplane flying home. Wilson drove directly to the airport after they left the doctor's office. He greeted me at the gate and told me Leon was waiting in the car.

    "Leon?" I questioned. I remember thinking the waves must have been terrible that day.

    "He's been in an accident, but he's going to be fine."

    A traveling working mother's worst nightmare had come true. I ran to the car so fast that the heel of my shoe broke off. I swung open the door, and my son with the patched eye was leaning forward crying, "Oh, Ma, I'm so glad you're home."

    I cried in his arms telling him how awful I felt about not being with him.

    "It's okay, Mom," he comforted me. "You don't know how to surf anyway."

    "What?" I asked, confused by his logic.

    "I'll be fine. The doctor says I can go back in the water in eight days."

    I wanted to tell him he wasn't allowed to go near water again until he was 35, but instead I bit my tongue and prayed he would forget about surfing.

    For the next seven days he kept pressing me to let him surf again. One day after I had repeated "No" to him for the 100th time, he beat me at my own game.

    "Mom, you taught us never to give up what we love."

    I gave in.

    Back then Leon was just a boy with a passion for surfing. Now he ranks among the top 25 professional surfers in the world.