I had been following the yellowish-green markers for a “popular and easy” three-mile out-and-back hike. Immediately after the trailhead(山道的起点), the trail became very rocky and steep. But having read information about the hike, I knew within five minutes, I was supposed to reach the hike's first overlook.

    However, the overlook never arrived. Instead, I found myself lost in the woods. Pulling out my cellphone, I saw it read “no service”. I checked the last text message I'd sent to my mom. It read, “Conference ended…going for a small hike before my flight home this afternoon.” I put my phone away and kept moving and yelling, “Help! Is anybody out there?” Every so often, I'd stop to listen, but I never heard a reply.

    I got out my phone again. The battery was running out fast as it searched for a signal. I struggled to find a place where I could get service. When I did, I called my mom. It went through! In a shaky voice, I said, “Mom?” And then the call dropped. More than 1,500 miles away, my mom instantly knew something was wrong. She called the Denver Police Department and was directed to the US Forest Service.

    This was how I was introduced to John, an operator from the US Forest Service. Following John's instruction on the phone, I finally escaped from the woods. I breathed a sigh of relief. Then my phone rang, and it was John, making sure I was still going in the right direction. “By the way,” he said, “we've had your mother on hold this whole time. We know once you get down the mountain, you will absolutely want to give her a call.”

    Adding math talk to story time at home is a winning factor for children's math achievement, according to a new research from a university. The study from psychologists Sian Beilock and Susan Levine shows a marked increase in math achievement among children whose families used Bedtime Math, an iPad app that delivers engaging math story problems for parents and children to solve together.

    Even children who used the app with their parents as little as once a week saw gains in math achievement by the end of the school year. The app's effect was especially strong for children whose parents tend to be anxious or uncomfortable with math.

    Previous research from this group has demonstrated the importance of adults' attitudes about math for children's math success. For example, a recent study found that math-anxious parents who help their children with math homework actually weaken their children's math achievement.

    The new findings demonstrate that structured, positive interactions around math at home can cut the link between parents' uneasiness about math and children's low math achievement.

     “Many people experience high levels of anxiety when they have to solve a math problem, with a majority of adults feeling at least some worries about math,” said Beilock, professor in Psychology and author of Choke, a book about stress and performance. “These math-anxious parents are probably less likely to talk about math at home, which affects how competent their children are in math. Bedtime Math encourages a dialogue between parents and kids about math, and offers a way to engage in high-quality math interactions in a low-effort, high-impact way.”

    Study participants included 587 first-grade students and their parents. Families were given an iPad installed with a version of the Bedtime Math app, with which parents and their children read stories and answer questions involving math, including topics like counting, shapes and problem-solving. A control group received a reading app that had similar stories without the math content and questions related to reading comprehension instead. Children's math achievement was assessed at the beginning and end of the school year. Parents completed a questionnaire about their nervousness with math.

    The more times parents and children in the math group used the app, the higher children's achievement on a math assessment at the end of the school year. Indeed, children who frequently used the math app with their parents outperformed similar students in the reading group in math achievement at year's end.

    I had a teacher who used to wake up in class by shouting: "The early bird gets the worm!" I say "let him have the worm". I hate food that doesn't stay still, and avoid Japanese restaurants for that very reason. Anyway, I stopped eating worms at the age of three, switching to regular breakfasts of cereal(谷物), to which I would add extra sugar.

    Recently I was thinking about early birds and the competitive spirit after receiving a letter from a reader in Malaysia: "My son deliberately throws away marks because he doesn't like to be top of the class. What shall I do?" Give him a round of "applause" for being smart! Actually many children in Asia tend to be the focus by performing better.

    Placed into a very competitive class when I was 11, I quickly learned the ideal position was second to last. The top three performers and the very last person are highlighted; the second-to-last contestant is INVISIBLE. And it's an easy position to get—just deliberately underperform at every test. I could do that. I once came second to last in eight straight sports day races. No one suspected anything. I was so invisible that I could have robbed a bank in my street and no one would have noticed.

    At the London Olympics a few months ago, badminton pairs from three Asian countries deliberately tried to lost matches to draw good lots in later rounds. It was funny to watch, but they were all thrown out for poor sportsmanship. What they really needed were acting lessons, their moves were so unconvincing. "Oops, I hit the ball in entirely the wrong direction."

    The other day, I took the children out and they raced for the car. "I'm first," said one. The second said: "First is worst, second is best." Together they sang at the last one: "And third's the one with a hairy chest."

    It struck me that the organizers of sports matches could use this song when people deliberately lost matches. "I lost," the delighted loser will say. The judges could still declare them winners, pointing to a new, optional regulation: "First is worst, second is best, third's the one with a hairy chest."

    American high school students are terrible writers, and one education reform group thinks it has an answer: robots. Or, more accurately, robot-readers—computers programmed to scan students' essays and spit out a grade.

    Mark Shermis, professor of the College of Education at the University of Akron, is helping to hold a contest, set up by the William and Flora Hewlett Foundation (WFHF), which promises $ 100,000 in prize money to programmers who write the best automated grading software. "If you're a high school teacher and you give a writing task, you're walking home with 150 essays," Shermis said. "You're going to need some help."

    Automated essay grading was first proposed in the 1960s, but computers back then were not up to the task. In the late 1990s, as technology improved, several textbooks and testing companies jumped into the field. Today, computers are used to grade essays on South Dakota's student writing assessments and a handful of other exams, including the TOEFL test of English fluency, taken by foreign students.

    The Hewlett contest aims to show that computers can grade as well as English teachers—only much more quickly and without all that depressing red ink. "Automated essay scoring is objective," Shermis said. "And it can be done immediately. If students finish an essay at 10 pm, they will get a result at 10: 01 pm."

    Take, for instance, the Intelligent Essay Assessor, a web-based tool marketed by Pearson Education, Inc. Within seconds, it can analyze an essay for spelling, grammar, organization, and help students to make revisions. The program scans for key words and analyzes semantic (语义的) patterns, and Pearson claims that it can understand the meaning of text much the same as a human reader.

Kelli Boehle says her son Nik was an amazing and caring person. Nik was diagnosed(诊断) with cancer in 2008 when he was 17. He passed away in 2012. But Nik's kindness and generosity have lived on long after his death.

After he was diagnosed and started treatment, Nik was granted (给予) a wish experience from the Make-A-Wish Foundation. "For just this period of time, we didn't think about cancer, "Kelli Boehle said. "All we thought about was enjoying our time together."

In 2009, Nik met another young man Nate, who was also going through cancer treatment. He'd been diagnosed a month after turning 18, and Nik learned he was too old to qualify for a wish. The night before Nik passed away, he asked his mother to help ensure that young adults fighting cancer could have their wishes come true too. 

"It was like a seed he planted that just wouldn't stop coming into my mind, " she said. In 2012, Kelli Boehle started Nik's Wish. The nonprofit grants wishes to young adults between the ages of 18 and 24 who are battling cancer. Nate was the organization's first wish recipient. "It's meant to bring them joy and know that they're loved and that we're fighting for them, too, "Kelli Boehle said. 

Recently, 19-year-old Jordan Morrow received her wish to attend a Taylor Swift concert as part of a trip to Los Angeles. For Morrow, who has spent the last year battling brain cancer, going to the concert has done more than lift her spirits. "I think it's something to get me through whatever comes my way, "she said. "And I'm thankful for Nik's Wish for that. "

In the 11 years since Nik passed away, the organization has granted more than 300 wishes across more than 30 states. In the beginning, Kelli Boehle says she wasn't sure she could be a wish maker and work closely with the young adults. But now, it's her favorite thing to do.