For a year and half, kids sent hurtful messages like “You are ugly.” or “Why are you still alive?” to Rebecca Sedwick. In 2013, Rebecca, then 12, couldn't stand it anymore. She took her own life near her home in Florida. Soon afterward, Trisha Prabhu read about the story. “I was surprised and heart-broken,” said Trisha, now 15, who is from Naperville, Illinois, “I know that I had to do something to stop this from ever happening again.”

    Trisha did some research. Studies show that one fourth to half of all teens in the US have been cyberbullied (网络欺凌). Experts say that if you are ever bullied online, you should tell a trusted adult. Tell the cyberbully to stop, and prevent him or her from contacting you again. Print and save messages to share with the police. This is good advice, agrees Trisha. But these methods all take place after the bullying has already happened. Trisha had a different idea. Why not teach cyberbullies to stop before they post these messages?

    Trisha's research won awards, including a prize in the Google Science Fair. Then, Tresah built the ReThink app (应用软件). It is programmed to recognize words or phrases that could be hurtful. When that happens, different warning messages come out. “Don't say things that you may regret later!” says one message. Others ask, “Are you sure you want to say this?” and “Are these words really yours?”

    Now Trisha is working on a version(版本) of ReThink for computers. “I am a big dreamer,” she says. “I want to stop cyberbullying before the hurt is done.”

    We humans spend about one-third of our lives asleep. This may sound like a lot of time, but it is not wasted. Sleep not only helps us stay healthy but it also helps our brains remember. Our brains need good sleep to remember what we do and learn during the other two thirds of our lives when we are awake.

    Researchers at the University of Wisconsin-Madison have found that sleep helps improve brain performance by shrinking(收缩)synapses in the brain. A synapse is the area where cells pass messages to other cells.

    Scientist Chiara Cirelli is a leader at the school's Center for Sleep and Consciousness. She told the reporter that sleep is when the human brain mixes information it has learned while awake into its general collection of knowledge. Meanwhile, the brain forgets unimportant details. This forgetting is important. It makes space for new learning and new memories.

    Cirelli said that the Centers research began with this hypothesis(假设): We sleep so that our brain can repair and refresh itself. She said the idea seems simple and reasonable. However, testing and discovering how it works has been extremely difficult.

    Synapses are only about 20-40 nanometers(纳米)wide. The team began their study by measuring the size of the synapses to look for changes in these already tiny spaces between nerve cells. Cirelli says the process(过程) is difficult because"all the actual measurements of the synapses have to be done by hand." The team had to wait until improvements in laboratory technology made it possible to see these tiny changes. A University of Wisconsin press release called the research a"huge job." Many research specialists worked for four years to photograph, rebuild and study certain areas of a mouse brain. The report also said the scientists measured 6,920 synapses.

    Cirelli says they found that our synapses shrink as our brains clean themselves during sleep. We wake up refreshed and ready to fill those synapses with new information. The research findings are the result of years of hard work at the University of Wisconsin Madison. The researchers published their findings in the journal Science.

    Anyone watching the autumn sky knows that migrating birds fly in a V formation, but scientists have long debated why. A new study finds that these big－winged birds carefully position their wingtips and flap(拍动) at the same rate, probably to catch the upward movement of air and save energy during flight.

    There are two reasons birds might fly in a V formation: It may make flight easier, or they're simply following the leader. Squadrons(中 队) of planes can save fuel by flying in a V formation, and many scientists suspect that migrating birds do the same. Models that treated flapping birds like fixed－wing airplanes show that they probably save energy by drafting off each other, but currents created by airplanes are far more stable than those coming off of birds.

    Just as aerodynamic(气动力) calculations would predict, the birds positioned themselves to fly just behind and to the side of the bird in front, timing their wing flaps to catch the uplifting eddies(涡流). When a bird flew directly behind another, the timing of the flapping reversed(相反) so that it could minimize the effects of the downdraft coming off the back of the bird's body. “We didn't think this was possible,” Usherwood says, considering that the difficult achievement requires careful flight and incredible awareness of one's neighbors. “Perhaps these big V formation birds can be thought of quite like an airplane with wings that go up and down.”

    The findings likely apply to other long－winged birds, such as pelicans and geese, Usherwood says. Smaller birds create more complex wakes(尾波) that would make drafting too difficult. The researchers did not attempt to calculate the birds' energy savings because the necessary physiological measurements would be too invasive for an endangered species. Previous studies show that birds can use 20% to 30% less energy while flying in a V.

    Scientists do not know how the birds find that aerodynamic sweet spot, but they suspect that the animals line themselves up either by sight or by sensing air currents through their feathers. In future studies, the researchers will switch to more common birds, such as pigeons or geese. They plan to investigate how the animals decide who sets the course and the pace, and whether a mistake made by the leader can ripple through the rest of the flock to cause traffic jams.

    With smart technology increasingly influencing all aspects of our lives, it is only a matter of time before someone invents “smart” shoes—ones that can be made based on personal needs. Called “ShiftWear”, the sneakers are the brainchild of a team of businessmen, and engineers led by New York-based designer David Coel.

    The adaptable shoes can be customized by using a smart phone app. Shoe owners will have the option of selecting a design from a variety of HD pattern by famous artists or creating one themselves. The company's founders imagine a marketplace where artists can not only share but also sell their designs to others. Despite being electronic, the designs are clearly visible even in the brightest sunlight. What's even cooler is that by switching on a backlight, users can even show off their designs in the dark!

    According to Coel, the sneakers will keep their charge “forever” if only images are displayed. Though they will need periodic recharging, active users have nothing to worry about. That's because the shoes are equipped with special walk-n-charge technology that powers the shoes—with every step. Inactive users also have options of charging the sneakers without using wires.

    The bottom part of the shoes is covered with Kevler fibers, a kind of strong material, reducing normal wear and tear. Even better? They are completely waterproof (not let water through) and can even be thrown into an ordinary laundry machine for a quick wash! The company predicts that the shoes will range the price from $150 to $1000 depending on the size of the E-panels where the designs are displayed.

    This is not the first time that electronics and shoes have combined. Lithuania-based iShuh Technology has come up with a similar concept that connects e-reader panels to a smart phone app via the Bluetooth. Whether these smart shoes become as popular as our smart devices remains to be seen, though they surely are attractive.

    If you make a list of the top ten most challenging jobs in the world, chances are that being a teacher will not make the cut. Let's think about their complex task millions of educators face each day as they try to teach a group of often unfriendly, disorderly kids into intelligent, well-rounded individuals. That surely has to be the toughest job in the world, especially taking into consideration that there is no promotion waiting for them even if they are wildly successful!

    What if these all-important individuals that we often take for granted disappear from our lives? That was what Project Ed and Participant Media's teaching campaign asked filmmakers of all ages to envision for their recently-held contest.

    Their short films were called "A World without Teachers", whose intention was to inspire more young people to become teachers. However, the 62 amazing video submissions (提交物) also serve as a reminder of how terrible things would be if we didn't have these selfless individuals guiding us through life. What was interesting is that even the youngest contestants didn't accept the idea that there's no person to tell them what to do.

    High-school student Savannah Wakefield considered if art as we know today would have been different without teachers. Would C. Monet have discovered his talent for impressionism?

    Miles Horst won the 1,000-dollar prize for the best adult submission, lie pictures n world where teachers are replaced by a "brain box". Youth group winner Marina Barham's video describes a fact we all know but often forget. Teachers don't just teach; they inspire—something that no electronic device, no matter how smart, can do!

    So the next time you think your teacher is being "troublesome" for trying to channel you in the right direction, imagine a life without him/her.

Food festivals are a common occurrence in the UK and take place in all sorts of places and at all sorts of times. Whatever your taste, there's a food festival to match — no matter how specialized. 

⒈Meatopia 

This three-day, London-based festival takes place at the end of August and is a meat lover's paradise. In addition to a range of legally sourced meat products, from juicy burgers to tender steaks, attendees can listen to live music, watch butchery demonstrations, and attend informal meat-based workshops. 

⒉The National Honey Show 

If you have a sweet tooth, then it could be that the National Honey Show, which started in 1921 and is the largest event of its kind, is the place for you to be. This three-day event attracts many local entries who showcase their sweet golden honey, some of which is sold globally. 

⒊The Orange Sauce Festival 

Have you heard about a festival that is devoted only to orange sauce? Held in Cumbria, this sweet, fragrant festival has been running for 3 years. What attracts people most is a competition to find the best homemade orange sauce. There are thousands of participants from over 30 different countries across the globe, bringing their local snacks to share here. 

⒋The Ginger and Spice Festival 

If you'd prefer something with a little more kick to it, then you could attend The Ginger (姜) and Spice Festival held in Market Drayton. Unlike other food festivals, it celebrates its town's historic connection to Robert Clive, who returned from India with ginger. Because of this, they specialize in baking gingerbread, but also sell a range of traditional spices from mild to hot.