One hot night last August, I tried everything I could think of — toys, songs etc. to make him fall into sleep, but he just couldn't do it. Since I believed that a long night was waiting for me ahead, I had no choice but to bring a TV into his room to kill off the hours until dawn. I was surprised that the moment I turned on the TV the baby became quiet right away and fixed his little eyes brightly on the screen. Not willing to waste an opportunity for sleep, I then tiptoed(蹑手蹑脚地行进) out of the room, leaving him to watch the boring TV programs. I heard no more of the baby's crying that night and the next morning when I went into his room, I found him still watching TV by himself. I found there was a metaphor(暗喻) in my baby's behavior(行为) for the new generation. When I gave my boy some books to go over, he only spit upon them; when I read to him, he did not feel comfortable. And so it is in the schools with my students. I find that our students don't read and they look down upon reading and make light of those of us who teach it. All they want to do is watch TV. After this experience with the baby, however, I have drawn a conclusion: “Let them watch it!” If television is that much more attractive to children than books, why should we fight against it? Let them watch what they want！

    The National Air and Space Museum in Washington，DC has thousands of objects on display，including the 1903 Wright Flyer，Charles Lindbergh's Spirit of St．Louis，the Apollo 11 Command Module Columbia，and a lunar rock you can touch．In addition to our exhibition galleries，you may want to visit the Albert Einstein Planetarium，Lockheed Martin IMAX Theater，and the Public Observatory on the east end．There are many things to do at the Museum in DC．We offer daily tours and educational activities for both children and adults．We also have scheduled lectures and events throughout the year．

Hours & Admission：Open every day except December 25．Admission is free．

    Regular hours：10：00 am to 5：30 pm

    Extended Hours：10：00 am to 7：30 pm

    December 26-30，2016

    March 30-April 20，2017

    Fridays and Saturdays，April 24-May 16，2017

    May 17-September 7，2017

    VISITING TIPS：

    Limit the Number of Bags：All visitors are screened through metal detectors upon entry．The fewer items you bring inside the Museum，the faster your entry．Before you visit，please review the list of prohibited items，which include pocket knives and tripods（三脚架）．Visitors carrying prohibited items will not be allowed inside the museum，so please leave them at home or in your car．

    No food and Drink：Only bottled water is permitted in the Museum．You may only consume food and other drinks in the Food Court，not in the Museum．Groups who bring food are encouraged to picnic on the National Mall．

Please Take Photos：You are welcome to take photos for personal use．However，tripods and monopods（单脚架） are not permitted without approval．

    First Aid：The Museum has a First Aid office and a nurse on duty．Please contact the nearest security officer or the Welcome Center for assistance．

    Visit the Welcome Center：At our Welcome Center in the South Lobby，staff and volunteers can answer any questions you have during your visit．

    Phone：202-633-2214

    E-mail：NASM-VisitorServices@si．edu

    Plan your dream vacation to one of these excellent destinations.

    St. Lucia

    Abundant rainforests and splendid mountains are all reasons to visit this Caribbean island. St. Lucia offers the perfect mix of relaxation and adventure. To take in the breathtaking scenery, plan to hike the Piton Mountains or dive in the waters of Anse Chastanet.

    Banff. Alberta

    This Canadian destination will bring out the explorer in anyone who visits. From hiking and whitewater rafting to skiing and snowboarding, Banff offers travelers an abundance of year-round outdoor activities. The Lake Louise Ski Resort is one of the largest in North America and the striking photo opportunities of the Canadian Rockies from Moraine Lake can't be underestimated (低估).

    Machu Picchu

    According to travelers, a visit to this Peruvian UNESCO World Heritage (遗产) site is a once-in-a-lifetime adventure. Located in the Andes Mountains, it is the most familiar icon (象征物) of Inca civilization. Spend a few days accustoming yourself to the altitude in the neighboring city of Cusco, where you can experience a mix of Incan and Spanish cultures.

    Great Barrier Reef

    It's easy to see why the Great Barrier Reef is one of the Seven Natural Wonders of the World – it stretches nearly 1,500 miles along the eastern coastline of Australia and features about 3,000 reefs, 900 islands and more than 1,500 species of fish. Travelers can see these amazing natural structures from the air or underwater. However, large amounts of coral bleaching (褪色) caused by rising ocean temperatures put this place's continued existence at risk, so plan your visit soon to see this awesome sight up close.

Plastic-Eating Worms

    Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场) and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

    Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物)and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms' stomachs. Their findings were published in Cun ent Biology in 2017.

    Federica Bcrtocchini, co-author of the study, says the worms' ability to break down their everyday food — beeswax — also allows them to break down plastic. "Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well," she explains, "The wax worm evolved a method or system to break this bond."

    Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

    Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply "millions of worms thrown on top of the plastic."

    About a month after I joined Facebook, I got a call from Lori Goler, a highly regarded senior director of marketing at eBay. She made it clear this was a business call. "I want to apply to work with you at Facebook," she said. "Instead of recommending myself, I want to ask you: What is your biggest problem, and how can I solve it?"

    My jaw hit the floor. I had hired thousands of people over the previous decade and no one had ever said anything remotely like that. People usually focus on finding the right role for themselves, with the implication that their skills will help the company. Lori put Facebook's needs front and center. It was a killer approach. I responded, "Recruiting is my biggest problem. And, yes, you can solve it."

    Lori never dreamed she would work in recruiting, but she jumped in. She even agreed to trade earnings for acquiring new skills in a new field. Lori did a great job running recruiting and within months was promoted to her current job, leading People@Facebook.

    The most common metaphor for careers is a ladder, but this concept no longer applies to most workers. As of 2010, the average American had eleven jobs from the ages of eighteen to forty-six alone. Lori often quotes Pattie Sellers, who came up with a much better metaphor: "Careers are a jungle gym, not a ladder."

    As Lori describes it, there's only one way to get to the top of a ladder, but there are many ways to get to the top of a jungle gym. The jungle gym model benefits everyone, but especially women who might be starting careers, switching careers, getting blocked by external barriers, or reentering the workforce after taking time off. The ability to create a unique path with occasional dips, detours (弯路), and even dead ends presents great views of many people, not just those at the top. On a ladder, most climbers are stuck staring at the butt of the person above.

What is the best part of a typical relaxing summer day? Nothing is better than sitting in an armchair with a beer and some chips in your hand, enjoying the great comfort.

The much-loved combination of beer and chips is being exploited for the first time to deal with climate change. Chips firm Walkers has adopted a technique it says will cut CO₂ emissions (排放) from its production process by 70%.

The technology will use CO₂ captured from beer processing in a brewery (啤酒厂), which is then mixed with potato waste and turned into fertilizer. It will then be spread on UK fields to feed the following year's potato crop. Creating fertilizer normally produces high CO₂ emissions, but the technology adopted by Walkers makes fertilizer without generating CO₂. So, the beer-and-chips combination performs a double function. It stops the emission of brewery CO₂ into the atmosphere — and it saves on the CO₂ normally generated by fertilizer production.

This Creative win-win solution was developed with an approval from the UK government by a 14-employee start-up called CCm. The fertilizer was experimented on potato seed beds this year, and next year Walkers will install CCm equipment at its Leicester factory to prepare for its 2022 crop.

A decision has not yet been made on which brewery Walkers will work with on this. The new technology adds to carbon-saving techniques already under way. The firm has installed an anaerobic digester (厌氧消化池), which feeds potato waste to bacteria to produce a useful gas. The gas is burned to make electricity for the chip-frying process — so this saves on burning gas or coal.

The new system will go a step further by taking away potato "cake" left after digestion — and mixing the brewery CO₂ into it to make an enriched fertilizer which will help put carbon back into the soil as well as encouraging plant growth.

It's an example of scientists finding ways to use CO₂ emissions which otherwise would increase the over-heating of the planet.