In the spring of my career, I found myself questioning the choice of my life's work. The students did not appear to be motivated; the paperwork was overwhelming (巨大的) and the constant changes of educational direction were discouraging. But I just could not bring myself to do anything else. “Next year,” I would say, “next year I will switch jobs, make more money and have far less stress.” Next year just never came. I am now in my forties. And while I am no longer in the classroom or at the schoolhouse, I remain an educator. It finally dawns on me that there is no other profession that will let me change children's minds and have an impact on their future. For every student that finally “got it”, for every new teacher that said, “You inspired me to stay,” I get the raise that has never quite made it to my paycheck.

    I was on a plane recently and the flight attendant asked my name. When I told him, he said, “I knew that was you! You taught at my elementary school. You made me take my cap off in the building and told me I was handsome.” He then paused and said, “I think I kept my hat on until you saw me, just so I could get that compliment (赞美). Thank you for making me feel special.”

    We have now entered an age where nothing is private and secrets are hard to keep. Your “friends” are counted by simply clicking a button. Face-to-face interactions are seen by many as unnecessary and time-consuming. Of course, we can do anything online, including teaching and learning. But I guess I am just old school. I want to look into your eyes when the answer finally dawns on you.

    Minutes after the last movie ended yesterday at the Plaza Theater, employees were busy sweeping up popcorns and gathering coke cups. It was a scene that had been repeated many times in the theater's 75-year history. This time, however, the cleanup was a little different. As one group of workers carried out the rubbish, another group began removing seats and other theater equipment in preparation for the building's end.

    The film classic The Last Picture Show was the last movie shown in the old theater. Though the movie is 30 years old, most of the 250 seats were filled with teary-eyed audience wanting to say good-bye to the old building. Theater owner Ed Bradford said he chose the movie because it seemed proper. The movie is set in a small town where the only movie theater is preparing to close down.

    Bradford said that large modem theaters in the city made it impossible for the Plaza to compete. He added that the theater's location (位置) was also a reason. “This used to be the center of town,” he said. “Now the area is mostly office buildings and warehouses.”

    Last week some city officials suggested the city might be interested in turning the old theater into a museum and public meeting place. However, these plans were given up because of financial problems. Bradford sold the building and land to a local development firm, which plans to build a shopping complex on the land where the theater is located.

    The theater audience said good-bye as Bradford locked the doors for the last time. After 75 years the Plaza Theater has shown its last movie. The theater will be missed.

    Scientists say we are all born with a knack for mathematics. Every time we scan the cafeteria for a table that will fit all of our friends, we're exercising the ancient estimation center in our brain.

    Stanislas Dehaene was the first researcher to show that this part of the brain exists. In 1989, he met Mr. N who had suffered a serious brain injury. Mr. N couldn't recognize the number 5, or add 2 and 2. But he still knew that there are “about 50 minutes” in an hour. Dehaene drew an important conclusion from his case: there must be two separate mathematical areas in our brains. One area is responsible for the math we learn in school, and the other judges approximate amounts.

    So what does the brain's estimation center do for us? Harvard University researcher Elizabeth Spelke has spent a lot of time posing math problems to preschoolers. When he asks 5-year-olds to solve a problem like 21+30, they can't do it. But he has also asked them questions such as, “Sarah has 21 candles and gets 30 more. John has 34 candles. Who has more candles?” It turns out preschoolers are great at solving questions like that. Before they've learned how to do math with numerals and symbols, their brains' approximation centers are already hard at work.

    After we learn symbolic math, do we still have any use for our inborn math sense? Justin Halberda at Johns Hopkins University gave us an answer in his study. He challenged a group of 14-year-olds with an approximation test: The kids stared at a computer screen and saw groups of yellow and blue dots flash by, too quickly to count. Then they had to say whether there had been more blue dots or yellow dots. The researchers found that most were able to answer correctly when there were 25 yellow dots and 10 blue ones. When the groups were closer in size, 11 yellow dots and 10 blue ones, fewer kids answered correctly.

    The big surprise in this study came when the researcher compared the kids' approximation test scores to their scores on standardized math tests. He found that kids who did better on the flashing dot test had better standardized test scores, and vice versa (反之亦然). It seems that, far from being irrelevant, your math sense might predict your ability at formal math.

Discover Nature Schools programs

Becoming Bears (Kindergarten-2 grade)

    By becoming baby bears, children learn from their "parent" to survive the seasons. Kids will find safety in the spring and learn kinds of food bears eat during the summer, and then create a cave for winter hibernation(冬眠). After learning the skills needed to survive, students will go out of the cave as an independent black bear able to care for themselves. (1.5-2 hours)

Whose Clues? (3-5 grade)

    Kids will discover how plants and animals use their special structures to survive. Through outdoor study of plants and animals, kids will recognize their special structures and learn how they enable species to eat, avoid their enemies and survive. Using what they have learned, kids will choose one species and tell how they survive in their living places. (3-4 hours)

Winged Wonders (3-5 grade)

    Birds add color and sound to our world and play an important ecological (生态的) role. Students will learn the basics of birds, understand the role birds play in food chains and go bird watching using field guides and telescopes. Students will do hands-on activities. Students will use tools to build bird feeders, allowing them to attract birds at home.(3-4 hours)

Exploring Your Watershed (6-8 grade)

    We all depend on clean water. Examining how our actions shape the waterways around us. Go on a hike to see first-hand some of the challenging water quality problems in a city. Students will test the water quality to determine the health of an ecosystem.

● Each program is taught for a class with at least 10 students.

● All programs include plenty of time outdoors. So please prepare proper clothing, sunscreen and insect killers for children.

● To take part in a program, please email dcprograms@mdc.mo.gov.

    Vinegar is great. It makes salad, fries and dumplings taste better, and you can even clean your windows with it. And now, according to scientists, it may even help the planet's population to ease hunger.

    Researchers from the RIKEN Center for Sustainable Resource Science (CSRS) in Japan found that growing plants in vinegar makes them more resistant to droughts.

    This could mean that in the future, worries about climate change affecting the world's supply of food will be much lower.

    The discovery was made after the researchers studied the Arabidopsis, a plant known for its ability to survive in dry weather. It was found that when the plant was placed in drought-like conditions, it produced a chemical called acetate(醋酸盐) – the main component of vinegar.

    After discovering this, the scientists experimented further by adding acetate to the soil of other plants, before they stopped giving them water completely. After leaving the plants for 14 days, they found that the ones treated with acetate had survived, while the untreated plants had dried up and died. It's hoped that this simple method of survival could soon be used to help farmers in dry countries keep their crops alive.

    Jong Myong Kim, co-author of the study, told Popular Science magazine that he's already been in touch with people all over the world who are interested in trying this simple and cost-effective method out for themselves from flower growing companies to amateur gardeners.

    Although at this point keeping thirsty plants alive isn't as easy as just pouring vinegar over them, Kim said he and his team are working on making the process as simple as possible. "Now we are trying to cooperate with some farmers, and also some companies, to make a method to apply this system." he said.

    And for those of us who always forget to ask our neighbors to water our plants when we go away, hopefully this means the end of returning home from a trip to find our favorite flowers have died.

Nature supports us in a wide variety of ways, whether we are conscious of these gifts or not. {#blank#}1{#/blank#}By following these tricks for first-time campers, anyone can engage with nature in a more grateful way.

Take full advantage of Nature

If you're close to flowing water, you can choose from various approaches to stay hydrated, as well as wash dishes and do laundry, without taking much trouble to bring all your water with you. {#blank#}2{#/blank#}This is a fantastic way to begin your day.

Do your Research

{#blank#}3{#/blank#}Some trees supply wood that's appropriate for making walking sticks. Some wood is suitable for starting fires, while other wood is fit for keeping them going. Other trees may provide nuts and fruits.

Fully Enjoy Nature

My hope is that the strategies for first-time campers will help you appreciate the great outdoors. Whether you're hiking, fishing, swimming, or cooking by a warm fire, each of them is fun. I live approximately 2 miles from fabulous Current River, which is fed by cold springs some 40 miles upstream. {#blank#}4{#/blank#}

I have no interest in hunting or party; I fancy simply sitting on a sand bar at dawn, watching the mist rise from the water. {#blank#}5{#/blank#} I listen for the beavers making splashes at night with their wide, flat tails. I hear coyotes howling at night too. I've seen cottonmouth snakes and even panther tracks! I love the serenity and the small thrills, the kinds of experiences I wouldn't trade for anything in the world.

A. I see and hear all kinds of wildlife.

B. But nature isn't just there for us to exploit.

C. Set up a place where you can stay comfortably.

D. If you're near a body of water, you can go swimming.

E. Become familiar with different trees and what they offer.

F. If you can accept nature as it is, it can work in your favor.

G. The river stays cool pretty much year-round and is refreshing in summer.