If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline powered cars 50 years from now, giving out heat-trapping carbon dioxide(二氧化碳) into the atmosphere—and yet that carbon dioxide will not contribute to global warming.

    In a proposal by two scientists, vehicle emissions(排放) would no longer contribute to global warming. The scientists, F. Jeffrey Martin and William L. Kubic Jr., are proposing a concept, which they have named Green Freedom, for removing carbon dioxide from the air and turning it back into gasoline.

The idea is simple. Air would be blown over a liquid solution of potassium carbonate, which would absorb the carbon dioxide. The carbon dioxide would then be put to chemical reactions that would turn it into fuel(燃料): gasoline or jet fuel.

    This process could change carbon dioxide from an unwanted, climate-changing pollutant into a vast resource for renewable fuels. The cycle—equal amounts of carbon dioxide produced and removed—would mean that cars, trucks and airplanes using the synthetic(合成的) fuels would no longer be contributing to global warming.

    Although they have not yet built a synthetic fuel factory, or even a small model, the scientists say it is all based on existing technology. “Everything in the concept has been built, is operating or has a close cousin that is operating.” Dr. Martin said.

    The Los Alamos proposal does not go against any laws of physics, and other scientists who have independently suggested similar ideas. Dr. Martin said he and Dr. Kubic had worked out their concept in more detail than former proposals.

    There is, however, a major fact that explains why no one has built a carbon-dioxide-to-gasoline factory: it requires a great deal of energy.

    According to their analysis, their concept, which would cost about $5 billion to build, could produce gasoline at an operating cost of $1.40 a gallon and would turn economically practical when the price at the pump hits $4.60 a gallon.

    Other scientists said the Los Alamos proposal perhaps looked promising but could not evaluate it fully because the details had not been published. “It's definitely worth pursuing,” said Martin I. Hoffert, a professor of physics at New York University. “It's not that new an idea. It has a couple of pieces to it that are interesting.”

    The latest study by the University of Florida has found that eating from smaller, less beautiful, and even paper plates will help prevent overeating. Eating with a fork instead of a spoon can help you lose weight, the researchers say. Much to their surprise, they find that putting mirrors in the dining room will also help reduce weight.

    The researchers asked 185 college students to choose a chocolate cake or a fruit salad, and evaluated the taste. Those who ate in a room with a mirror scored the taste of junk food much lower than those in a room without a mirror. But the taste of fruit salad remained the same in any case.

    Lead scientist, Dr. Ata Jami, says that a glance in the mirror tells people more than just about their physical appearance. It enables them to view themselves objectively (客观地) and helps them to judge themselves and their behavior in the same way that they judge other people.

    The mirrors were found to push people to compare and match their own behavior with accepted social standards. The researchers believe it proves that people don't want to look in the mirror when they feel they are following the social standards. When they look in the mirror with mouths full of junk food, feelings of discomfort and failure can be increased. Therefore, the presence of the mirror lowers the taste of unhealthy food.

    However, researchers say this is only the case if people select the food they are eating, because they are responsible for that choice. The researchers suggest that mirrors be placed in dining rooms and other eating spaces, so that people will start eating more healthily.

    Teenagers in America know that they'll possibly need technical skills to find good jobs, but a new survey reveals that interest in technology-related careers may be decreasing.

The percentage of boys aged 13 to 17 who are interested in science, technology, engineering and math —or STEM —careers dropped from 36 percent in 2017 to 24 percent this year, according to a survey by Junior Achievement USA. The amount of girls interested in STEM careers stayed unchanged at II percent.

    But the 1, 000 survey participants still named technology as one of two key skills that will be necessary to prepare them for their future careers.

    "Kids don' t understand how technology can be applied to careers in addition to computers, and maybe robotics, "said Tammera L. Holmes, president of aviation consulting firm AeroStar Consulting （航空资询公司）.“That's all they know, so they can't really translate that interest to career pathways."

    When Holmes was in high school, her mom sent her to an event that featured (以......为专题)the pilots from World War II. One of the pilots took her for a ride and let her take the wheel immediately that was the career for me." she said.

    Women remain outnumbered(超过) by men in fields like technology. For people working to increase the number of women in these areas, the lack of growth in girls interest in STEM careers is concerning.

    Teenage girls are more interested than their male classmates in running after careers in which they can help others, said Ed Grocholski from Junior Achievement. Even with all the programs aimed at increasing girls' interest in STEM, "I don't think we really talk that much about how we improve people's lives through STEM," Grocholski said.

    Society needs to do better at making those connections for kids, said Katherine Latham, founder of an engineering firm. She used civil engineering as an example of a career that will continue to be important.

    However, the fact that students know they will need tech skills in their future careers is encouraging.

    The second skill they said they need is relationship-building.

    "That's going to be the new type of engineers," Latham said.

    The evening arrived; the boys took their places. The master, in his cooled uniform, stood at the table; his poor helpers were behind him; the gruel (稀粥) was served out; and after they spoke to God to give thanks, there was little time left to eat. The gruel disappeared immediately; the boys whispered each other, and encouraged Oliver to ask for more. Oliver was very hungry and decided to take a risk. He rose from the table; and went to the master, plate and spoon in hand, said:

"Please, sir, I want some more."

    ①

    The master was a fat, healthy man; but he turned very pale. He looked at Oliver in great surprise for some seconds, and nearly fell but for the support to the table. The helpers were frozen with wonder; the boys with fear.

"What!" said the master at last, in a confused voice.

"Please, sir," replied Oliver, "I want some more."

    The master hit Oliver's head with the ladle; and screamed for Mr. Bumble.

    ②

    The board were sitting in plotting (密谋) something, when Mr. Bumble rushed into the room in great excitement, and spoke to the gentleman loudly in the high chair, said:

"Mr. Limbkins, I beg your pardon, sir! Oliver Twist has asked for more!"

    ③

"For more!" said Mr. Limbkins. "Calm yourself, Bumble, and answer me clearly. Do I understand that he asked for more, after he had eaten the supper allotted (配给) by the dietary?"

"He did, sir, "replied Bumble.

"That boy will be hung, " said the gentleman in white. "I know that boy will be hung."

    Nobody was against the gentleman's opinion. A heated discussion took place. Oliver was put in a cold, dark room and no boys were allowed to talk to him; and a bill was next morning pasted on the outside of the gate, offering a reward of five pounds to anybody who would take Oliver Twist off the hands of the parish (教区).In other words, five pounds and Oliver Twist were offered to any man or woman who wanted an apprentice to any trade, business, or calling.

    ④

"I never was more convinced of anything in my life, "said the gentleman in white, as he knocked at the gate and read the bill next morning: "I never was more convinced of anything in my life, than I am that that boy will come to be hung."

    Alabama: Priester's Pecans

    Dessert in the South basically starts and ends with an ooey­gooey pecan (核桃) pie. Especially in Alabama, where the pecan is the official state nut. While there are plenty of farms that pick and package pecans, perhaps the most famous is Priester's, a family­run business that's been supplying Alabama with its favorite nuts for over seven decades.

    Alaska: Salmon jerky

    Forget beef jerky (肉干) ­ in Alaska, it's all about the salmon jerky. Home to five different species of the flavorful fish (king, red, pink, silver, and chum), the northernmost state produces nearly one­third of the wild salmon consumed around the world. Bonus: Salmon is one of the seven healthiest fish you can eat.

    Arizona: Saguaro cactus

    The largest cactus (仙人掌) in the United States, the saguaro cactus is found only in Arizona's Sonoran Desert. Living to be up to 200 years old, the cacti, whose flower is also the state's flower, are generally around 30 feet tall and can grow unlimited arms. Want to see for yourself? Visit one of these 10 outstanding desert escapes in America.

    California: Wine Guide

    It isn't called "Wine Country" for no reason. Northern California, specifically Napa Valley and Sonoma Valley, produce over 60,000 registered wine labels, making vino (酒类产品) the state's most valuable agricultural product. If you're looking for the most popular varietals (优质酿酒葡萄汁), the top two frequently planted grapes are chardonnay and cabernet sauvignon.

    As winter set in, it's the perfect time to get out of town and escape the seasonal mood disorder. Here are vacation ideas to adopt now.

    Costa Rica

    Costa Rica, located in the Valle del General, is an off-the-radar agriculture town that's not overrun with tourists. The area is known for its coffee, pineapples and sugar cane plantations, as well as its rich forests. What's more, you can enjoy horseback riding, spend afternoons at the spa or tour a nearby wildlife shelter to look out for colorful birds, sloths and other animals.

    Los Cabos, Mexico

    If you love wine, travel to Los Cabos, a beautiful vacation destination at the southern edge of the Baja Peninsula. During your getaway, you can enjoy special wine tastings and dinner cooked by Los Cabos's Michelin-starred chef. There are wildlife-viewing opportunities, too. From December through May, you can spot whales, manta rays and more wildlife.

    Petit St Vincent, the Grenadines

    This private Caribbean island was spared the anger of hurricanes Irma and Maria. What's more, the whole island is only 115 acres and has 22 cottages. Each cottage is located in a quiet place, and you can expect to unplug and recharge phones with no wireless connections, televisions or telephones in the cottages. Even better, you can spend your days admiring fascinating marine (海洋的) life at the Jean-Michel Cousteau Diving Caribbean center.

    The Exumas, Bahamas

    On Fowl Cay's 50-acre private island, you can enjoy a carefree escape. Days can be spent fishing, boating and diving before wandering along white sands. The resort features large one-, two- and three-bedroom houses. Best of all, if you're planning a group getaway or multigenerational trip, you rent the entire island for a one-of-a-kind island escape.