When Sarah Hansen first came to Bonnie Schlachte's ballet studio, she jokingly called herself a “weeble-wobble,” telling her ballet teacher that when she tried to walk, she would fall. “She couldn't walk across the room without holding on to something,” recalls Schlachte. “She would immediately fall.”

    Hansen was only in middle-school, but a progressive neurological disease was hindering her ability to walk, let alone do ballet. But Hansen had a tenacious spirit and desperately wanted to learn ballet. Hansen joined in weekly group classes at Schlachte's ballet studio called Ballet for all Kids, a studio that teaches children with disabilities. Soon after she began classes and private lessons, her family saw a vast improvement in her ability to move.

    She worked tirelessly in the studio, focusing on what her instructor wanted from her. “At the time, her foot wouldn't fully rest on the floor,” explains Schlachte. “That's why she couldn't stand on her own, there was no support.”

    Schlachte pushed her student, explaining to Hansen that her brain has neuroplasticity(可塑性) so eventually it will receive the message.

    As a mom, a classically trained ballerina, and holding a degree in psychology, Bonnie Schlachte was the perfect person to push Hansen to do her best. Schlachte put herself through college with dance and theater scholarships. After graduation, she came across an opportunity with children with developmental disabilities. She fell in love and chose to focus on jobs in that field.

    Years later, Schlachte found herself watching and celebrating Hansen, who at one point could barely walk, was now moving across the floor on her own two feet. “One day, her ankle dropped, and she put her whole foot on the ground,” says Schlachte. “I was crying, her mom was crying, it was a great moment.”

    A recent study by Citi Retail Services found that a growing number of people are embracing digital wallets or e-wallets, due in large part to their convenience and ease of use.

    E-wallets have been called the future of real-world payment technology.With major players like Alipay,WeChat and Apple Pay becoming popular,it seems to be a safe bet that a change in consumer payment technology is coming soon.

    CNN reporter Paul Ripley experienced a day in Beijing without his wallet."In China's largest cities, you can definitely survive without carrying a pocket full of cash and credit cards-as long as you've got your smartphone."He paid for breakfast by scanning a QR code on the window of a hole-in-the-wall restaurant.All he had to do was to enter a password and the transaction was complete.

    Unlike the situations in the US and other countries,"China doesn't have a really money-making credit card system, so Chinese people just skipped credit cards and went straight to mobile payments."Gu Yu,co-founder of the new payment app Mileslife,told CNN.He also pointed out the advantages of mobile payments."No coins or bills that can be lost or stolen. electronic receipts, the ease of keeping rack of spending-and of course,no wallet taking up space."he said.

    However, if we want to make e-wallets a mainstream trend a lot of things will have to change over the coming years.Perhaps one of the most important things that need to be changed is how people regard e-wallets.Linda Barrabee,research director for NPD Connected Intelligence, said in a statement."In order to promote on-the-go consumer transactions and commerce, wireless carriers, credit card companies, and e-commerce companies need to make sure the process is convenient,simple,and secure for consumers."

    Think of a seed buried in a pot. It's dark down there in the potting soil. There's no light, no sunshine. So how does it know which way is up and which way is down? It does know. Seeds send shoots up toward the sky, and roots the other way. Darkness doesn't confuse them. Somehow, they get it right.

    More surprisingly, if you turn a seedling (秧苗) or a whole bunch of seedlings upside down, as Thomas Andrew Knight of the Royal Society did around 200 years ago, the tips and roots of the plant will sense, “Hey, I'm upside down. Look! I. will turn my way to the right direction and do a U-turn.”

    How do they know? According to botanist Daniel Chamovitz, Thomas Knight about 200 years ago guessed that plants must sense gravity. Knight proved it with a crazy experiment involving a spinning plate.

    He attached a bunch of plant seedlings onto a disc. The plate was then turned by a water wheel powered by a local stream at a speed of 150 revolutions (旋转) per minute for several days.

    If you have been at an amusement park in a spinning teacup, you know that because of centrifugal force (离心力) you get pushed away from the center of the spinning object toward the outside.

    Knight wondered, would the plants respond to the centrifugal pull of gravity and point their roots to the outside of the spinning plate? When he looked, that's what they'd done. Every plant on the disc had responded to the pull of gravity, and pointed its roots to the outside. The roots pointed out, and the shoots pointed in. So Thomas Knight proved that plants can and do sense the pull.

    On a dark winter day in Russia in 1896, Sergei Prokofiev sat by a piano next to his mother. She was helping him compose (作曲) his first piece of music. Sergei was only five years old.

    He had overheard his parents discussing a terrible famine (饥荒) in India. The picture Sergei had of those hungry people in his mind caused him to write a story, in the form of musical notes. Sergei could not read music, so he picked out a tune on the piano keys, and his mother recorded the notes. Sergei titled it "Indian Gallop."

    Sergei's mother began giving him piano lessons for 20 minutes a day, and his ability grew quickly. She had a great love for music, too, and Sergei often lay awake in bed at night and listened to her play the piano.

    Sergei's parents found a famous music teacher for him. The teacher shouted at Sergei when he didn't practice reading and playing music. Sergei later wrote, "I wanted to compose great musical plays, and instead I was given all sorts of boring tasks." Yet he persisted with his studies and grew up to be a great composer.

    In 1936 a children's theater asked Sergei to write music that would teach children about different instruments. He was happy and wrote the piece in a week, calling it Peter and the Wolf.

    Sergei's Peter and the Wolf was enjoyed by children as well as adults. The first time Sergei played the piece on the piano, the children listening to it loved it so much that they made him play the ending three extra times. He was excited.

    Today Sergei Prokofiev is remembered not only for his contributions (贡献) to classical music, but also for his sense of fun.

    Hawaii, 2nd Edition

    Original price: $ 22.95

    Sale price: $ 20.95

    Summary: Hawaii is one of the world's premier vacation destinations, and this practical and fact- packed book shows why. Like other Traveler guides, it's a treasure of special features - walking and driving tours, in-depth Hawaiian history, a sample of the best of each island's activities, plus a selection of hotels and restaurants in every price range.

    Be the Pack Leader

    Original price: $ 25.95

    Sale price: $ 18.95

    Summary: Bestselling author Cesar Millan takes principles of dog psychology a step further, showing you how to develop the calm energy of a successful leader and use it to improve your dog's life and your own life. With practical tips and techniques, Cesar helps you understand and read your dog's energy as well as your own energy so that you can take your connection with your dog to the next level.

    Celebrate Hanukkah

    Original price: $ 15.85

    Sale price: $7.85

    Summary: The US astronaut Jeffrey Hoffman brought a menorah(烛台) and a dreidel (陀螺)on his Space Shuttle mission in 1993. Hoffman observed the traditional spinning of the dreidel, but wisely left the menorah unlit in several thousand liters of rocket fuel. Also included is the author's sure-to-please potato pancakes' recipe.

    A New Perspective of Earth

    Original price: $26.85

    Sale price: $ 20.85

    Summary: The author Benjamin Grant describes a unique collection of satellite images of the earth that offer an unexpected look at humanity. More than 200 images of industry, agriculture, architecture and nature highlight incredible patterns while also revealing a deeper story about human influence. This extraordinary photographic journey around our planet captures the sense of wonder gained from a new, aerial point and creates a perspective of the earth as it has never been seen before.

    My mother has a dining table which sits right in the middle of her dining room. It was once buried beneath piles of papers—magazines, articles, copies of schedules for vacations she took back in the 1990s, and baby pictures of grand children who are now paying off their college loans.

    My brother Ross and I recently flew to New York to visit my mother. "Mom, why don't we go through all that stuff?" Ross said. "No. Don't touch it!" My mother said. The next afternoon, when she couldn't find a bill she needed, Ross suggested it might be put somewhere in the dining room and that we find it together. "Besides," he said, "all those papers are clearly stressing you out." However, my mother just said, "Are you boys hungry?" And then she seemed to have lost herself in deep thought.

    On our last night there, my mother walked up to us with a small pile of unopened mails, which she had collected at the western edge of the dining table, and said, "Help me go through these." "Sure," I said. When we had succeeded in separating wheat from chaff (谷壳), I asked, "Would you want to deal with another little pile of papers?"

    My mother led the way  walking into the dining room the way an animal manager might be while entering a cage with tigers in it. Ross and I came in behind her and suddenly he reached for a pile of the papers on one side of the table. "No!" my mother said sharply. "Let's start at the other end. That's where the older stuff is." Finally, we threw 95 percent of the stuff into paper shopping bags. Then I asked what she wanted us to do with them, she surprised us all by saying, "Put them in the incinerator (垃圾焚化炉)."

    When I returned home, inspired by the visit to my mother, I sorted out my own accumulated(累积的) piles of papers, sold or gave away half of my possessions, and moved into a smaller house. It seems that my life has been cheaper and easier since then. And it proves that a small change does make a big difference.