One talented father created the tag “Dadfact” in an effort to persuade his child into eating their sandwiches using information that might not be completely reliable.

Flying is fine if you want to save time, but nothing beats the railway for a relaxing and down-to-earth journey. The Zhengzhou—Xuzhou and Xi'an—Fuzhou high-speed railways put into operation in September mark a connection of high-speed railways in China's eastern and middle-western regions, and they have brought out some of the country's best landscapes and cuisines.

    Here are four signature dishes(招牌菜) that you shouldn't miss as you travel along the railways.

Yangrou Paomo, Xi'an

    If one dish could represent Xi'an, the capital of Shaanxi, locals would tell you without doubt that it's Yangrou Paomo. It is a bowl of lamb soup served with hard flour “bread”, which is broken up and added to the soup. The soup is topped with slices of mutton, scallion(葱) and coriander(香菜). Then it is usually eaten with picked sweet garlic.

Soup Dumpling, Kaifeng

    A popular snack in Kaifeng, Henan, the dish is made up of three things: skin, meat and soup. The skin is made from flour, while the filling is usually pork. And just as its name suggests, the soup dumplings are filled with tasty soup. But how does the steaming hot soup get into the dumplings? It's actually been cooled and cut into cubes, which fit easily into the dough(面团). Along with the pork, the cubes become liquid soup once they're steamed.

Smelly Mandarin Fish, Huangshan

    Despite its name, Smelly Mandarin Fish(臭鳜鱼) is known for its good taste. A lot of travelers who visit Huangshan in Anhui want to taste it because they have heard of its reputation. Once the skin has been removed, the fresh is preserved in salty water for six to seven days, then fried and cooked in soy sauce. Although salting gives the fish its special smell, the original tender flesh is preserved well and given a delicious and unique taste.

Buddha Jumps Over the Wall, Fuzhou

    The dish has enjoyed an over 100-year-long worldwide reputation since it was invented in Fuzhou, Fujian in the late Qing Dynasty(1644-1911). Fotiaoqiang, or Buddha Jumps Over the Wall, got its interesting name from a poem a customer wrote. The poem said the dish was so delicious that upon smelling it, monks in the neighboring temple would jump over the wall to come and get some. Buddha Jumps Over the Wall is made up of many ingredients, including sea cucumber(海参), chicken, pork and mushroom. Because of these ingredients, it tastes extremely delicious while being highly nutritious at the same time.

    Car companies are developing vehicles that will plug into electric sockets, ust like many laptops, digital cameras, cell phones and Mp4 do. Called “plug-in vehicles”, these cars will get most of their power from electricity. Their drivers won't have to stop at gas stations as often as usual.

    The technology is more than just cool. In our car-filled world, plug-in vehicles could reduce the amount of gas we use, which keeps rising in cost now and then. Besides, driving around in these vehicles may even help the environment. Gas-burning cars produce a lot of greenhouse gas, which causes global warming.

    The first company-produced plug-in vehicles could hit the roads by 2020. But engineers still have a lot of work to do to make the technology practical and inexpensive.

    Batteries are the biggest challenge. In the plug-in-vehicle world，Li-ion(锂离子)batteries are getting the most attention. These batteries can store a large amount of energy in a small package, and they last a longer time between charges. Li-ion batteries can fit laptops, cell phones, heart instruments and other similar pocket ones.

    But because cars are so big and heavy, it would still require a suitcase-sized Li-ion batteries to power about 12km of driving. What's more, the batteries are much expensive.

    “A car filled with batteries could go a long distance,” says Ted Bohn, an electrical engineer in Chicago. “But it couldn't pull any people, and it would cost $100,000.” So researchers need to work out how to make batteries smaller and cheaper, among other questions.

    “The answers don't exist yet,” Bohn says, “As a kid, I thought someone someplace knows the answer to everything. All of these questions haven't been decided. That's what engineering is about-making a guess, running tests and getting fine results.”

Events

Long March exhibit

    The Shanghai History Museum is putting on an exhibition to mark the 60^th anniversary of the Long March. On show are more than 220 photos and 40 items that explain with pictures how the communist Red Army drew back from its besieged(被围困的) bases in Jiangxi Province and fought its way to northern Shanxi province in the mid-1930s. Explanations are all in Chinese. The show will end on November 20.

Time: 10:00 am—4:00 pm.

Address: 1286 Hongqiao Road

Admission: 8 Yuan for Chinese/ 15 Yuan for foreigners

Thai elephants

    Eight elephants from Thailand are entertaining visitors at Changfeng Park by riding bikes, playing basketball, balancing on a beam, dancing and blowing a mouth-organ. People are encouraged to have a tug-of-war(拔河比赛) with the animals or lie on the ground and have the elephants walk over them. The elephants give three shows a day at 9:30 am, 3:30 pm and 8:00 pm and there is an additional show at 1:30 pm at weekends. The show will end on November 15.

Address: 189 Daduhe Road

Admission: 30-40 Yuan

Dancing dolphins

    Dolphins jumping from the water to touch a ball, swaying their bodies to music, kissing people and doing math by tapping their tails have made the dolphinarium in Peace Park an attraction for children. Seals and sea lions also perform.

Hours: 10:30 am, 4:00 pm, and 7:30 pm

Admission: 20 Yuan for adults and 10 Yuan for children.

    My parents grew up during the Depression(大萧条) attending small country churches. At the close of Christmas Eve services, each child was given a brown paper bag containing an apple, an orange, nuts and several chocolates.

Years later, whenever Dad recalled that tradition, his eyes shone reliving the memory. My mother didn't share his enthusiasm. She always said the chocolates tasted cheap and old.

    Cheap chocolates or not, the paper bags with goodies were an event. Gifts of any sort during the Depression were rare, especially in large farm families with seven children.

    When our children were young and we were home for Christmas one year, Mom and Dad gave each of the grandkids a brown paper bag holding an apple, an orange, nuts and several chocolates. When we finished the 8-hour drive home after the holiday, there was a message waiting on the phone when we walked in the door. “Your ungrateful kids left their apples and oranges in the back of our refrigerator. No more fruit for them!” Grandpa and Grandma were joking, of course, but still there was a degree of disrespect in the kids leaving behind thoughtfully chosen gifts.

    But the paper bag didn't have a context for our children. They had never known fruit to be a scarcity(缺乏). They didn't appreciate the gift because they had never experienced the need the gift was meant to fill.

    The same is true of Christmas today. We don't appreciate the true gift of the season because we don't understand the need the gift was given to fill.

It's not like we don't know we have needs. We know them, all right—patience, love, self-control, strength, courage, faithfulness, forgiveness—it's just that we have become experts at numbing(使麻木) ourselves to our needs.

    The true gift of the season is a perfect fit for our every need. When a gift like apples and oranges fits a need, there is a cheerful satisfaction. When the gift of a Christmas tree fits a need, there is the joy of Christmas.

    Some people shy away from traveling alone while a few welcome it. So, what is it that makes traveling alone an attractive choice?

    First of all, the travel plan and all the decisions you make are yours alone. You don't need to worry about any other person or group. In other words, there are no arguments. Actually, you can be completely selfish.

    Traveling alone is also a great confidence builder. Yes, at times it can feel a bit lonely, but that is just one of many problems you will have to solve yourself, along with making your own preparations and setting your own goals.

    Besides, have you noticed that when you're on your own, people are more willing to start a conversation with you? Interestingly, people tend to keep a distance from couples and groups. However, the lone (独自的) traveler looks ready to connect with their fellow human beings and more likely to get into pleasant conversation about their trips.

    Here are two more exciting reasons why you should consider traveling alone. You will find you learn the language faster when you don't have someone else talking to you in your own language all the time. You are forced to communicate in the foreign language when you travel alone in a country that doesn't speak your native language. In addition, when you're on your own, you're free to meet someone who might turn out to be very important in your life.

    Of course, there may be things stopping you: You fear the unknown, or you have friends who may be upset by your decision to take off by yourself. You will have to make them believe the value of traveling done and allay any fears they might have, but with the technology at our fingertips, you can include them in the adventure.

Steager is an engineer at the University of Pennsylvania. His colleague Hyun Koo is an inventor and dental researcher there. Together, they found a way to form the nanoparticles（纳米颗粒）into long, skinny bristles（鬃毛）, a lot like the ones on a toothbrush. But these bristles shape-shift to fit whatever surface they encounter. They can even squeeze between teeth.

"A new way to clean teeth could help out anyone who finds this chore boring," says Koo. But it would be especially life-changing for people with disabilities or illnesses that make it difficult or impossible to hold and move a toothbrush.

The tooth-cleaning robot works thanks to two magnets（磁铁）. One goes on each side of the teeth. The nanoparticles sit in a water-based solution between the magnets. When the magnets are turned off, the nanoparticles float randomly in the solution. As soon as one magnet gets turned on, the nanoparticles clump together near its center. When you turn on the other magnet and turn off the first one, the nanoparticles extend outward in long, skinny bristles.

When there's a tooth in the way, these bristles can't stretch out as far as they want. So they push against the tooth's surface. If there's a gap between teeth, they push into the gap. Moving the magnets makes the bristles move against and between teeth.

Besides, as a bonus, the nanoparticles can kill what harms the teeth and keep them health y because it contains something commonly added to toothpaste and mouthwash.

The new invention is just a proof of concept. The researchers still need to turn it into a product that people will want to use. It must fit comfortably and safely in people's mouths. It can't draw too much power or cost too much. "There's a lot of engineering to get from here to there," says Steager. But he adds, "every good idea needs to have a start."