Model Railroading

    Would you like to know a fun way to learn about math? Well, you can do that with model railroading. Yes, it's true. You can learn about many school topics without using a school book. Besides that, there are many other benefits that model railroading brings us as well. In this article, we will discuss just a few of those benefits of model railroading.

Patience and problem solving skills

    When you build a model railroad, you have to plan your railroad out. You have to decide where the tracks (轨道) will go, where to put buildings, where to put streets and any other things you would like to add to your model railroad. Also, you have to think about any problems you may have with the design you choose. How will you make railroad crossings? How will you design hills, mountains, and rivers? Deciding on what to do with your model railroad takes a lot of thought and patience, but it is not as difficult as you may think.

Building skills

    With model railroading, you learn how to put together plastic models of buildings. Also, you can learn how to build a table for your design, or make scenery for the geography of your design. Your model railroad runs on electricity, so you learn about electronics as well. These are skills that not only help you build a model railroad; these skills will help you all throughout life.

Fun for family and friends

    Different from many video games, model railroading is a social hobby that lets you communicate with family and friends. This is because you have to communicate with family and friends as you build and run your model railroad. By spending time with the people in your life you love and care about, you learn to become closer and care more for each other. This is one of the best parts of model railroading as a hobby. Of course, the best part about model railroading is running the trains. Watching the trains run around the track and make all the sounds and do all the things that real trains do gives people hours of enjoyment. Also, there is great satisfaction in the fact that you, your family, and your friends built the model railroad.

    I hope you can learn to enjoy model railroading and experience all the benefits you just read about and many others. Happy railroading!

    Dry Ice is a unique substance which has many uses. Essentially, dry ice is frozen CO2. The first report of what we now call dry ice came from the French chemist Charles Thilorier in 1834. In 1924, the Drylee Corporation of America named the solid form of CO2 as "Dry Ice", which is what it is popularly called today.

    At normal atmospheric pressure, CO2changes directly from solid to gas. It skips the liquid phase（阶段）which makes regular ice wet. Frozen CO2is also much colder than regular ice. But regular ice freezes at 32 degrees Fahrenheit, CO2 changes from gas to solid at -109.3 degrees Fahrenheit. This extremely cold temperature makes it very dangerous to handle with bare hands. It can cause frostbite in a very short period of time.

    Dry ice has been used for a variety of purposes throughout the past century. Its primary use is to refrigerate food when electrical refrigeration isn't available. Through the process of sublimation (when CO2 changes from solid to gas), it can maintain cold food for a long time.

    If you've ever been to a play and seen heavy fog on the ground, it is likely that you have seen dry ice in action. This effect can be achieved because CO2 is heavier than air, so evaporated （挥发的）CO2 will sink and accumulate on the ground.

    Another interesting use for this substance is to bait（诱杀）insects like mosquitoes. These insects have sensors which guide them to CO2. They find the high concentration of CO2 in dry ice quite attractive.

    Mars has long been a mystery for human beings. We have been looking for evidence of life on Mars. In the 1960s scientists guessed that the polar ice cap of Mars was made of frozen CO2. More recent observations have shown that while the topmost layer consists of frozen CO2, the most of it is probably regular frozen water.

    I have learned something about myself since I moved from Long Island to Florida three years ago. Even though I own a home in Port St, Lucie just minutes from the ocean, an un-controllable urge wells up to return to Long Island even as others make their way south. I guess I am a snowbird stuck in reverse. Instead of enjoying Florida's mild winters, I willingly endure the severe weather on Long Island, the place I called home for 65 years.

    I'm like a migratory bird (候鸟) that has lost its sense of timing and direction, my wings flapping against season.

    So what makes me fly against the tide of snowbirds? The answer has a lot to do with my reluctance to give up the things that define who I am. Once I hear that the temperature on Long Island has dipped into the range of 40 to 50 degrees, I begin to long for the sight and crackling sound of a wood fire. I also long for the bright display of colors-first in the fall trees, and then in the lights around homes and at Rockefeller Center. Floridians decorate too, but can't create the special feel of a New England winter.

    I suppose the biggest reason why I return is to celebrate the holidays with people I haven't seen in months. What could be better than sitting with family and friends for a Thanksgiving turkey dinner, or watching neighbors children excitedly open gifts on Christmas? Even the first snowfall seems special. I especially enjoy seeing a bright red bird settling on a snow-covered branch. (My wife and I spend winters at a retirement community in Ridge, and I'm grateful that I don't have to shovel.)

    While these simple pleasures are not unique to Long Island, they are some of the reasons why I come back. Who says you can't go home?

Following the old saying of "early to bed and early to rise" I used to go to bed at 10 pm and get up early at 6 am to get ready for school. But that day, as it was cloudy, I continued to sleep for long, thinking it to be the early hours of the day.

Suddenly, I heard a loud voice which startled me up and made me sit upright. It was my mother's voice who was knocking and shouting, "Get up honey. It's 6:45 am already! You are getting late for school!" As it was a cloudy day, I hadn't realized that it was almost 7 and continued dozing for long!

But thank fully that day our pick-up person who generally used to come at 6:50 am got late due to the showers and arrived just in the nick of time when I was ready. By the time we reached school it was a quarter to eight and the drizzle from previous night had finally stopped. I entered the classroom fearing the teacher's anger, but saw only a few students had made it to school. Therefore, the principal declared a holiday. "Hurray!" We all cheered in a chorus at the unexpected holiday and decided to walk back home.

    As it had been continuously drizzling since the previous night there was water all over the place and the roads were impassable. Just then, at a distance my sister and I saw little kids playing in knee-deep water in the streets which touched the play button in us. We quickly approached them and merrily jumped and hopped in the pool of water with them. With shoes in our hands we continued parading on the muddy streets. We were thrilled and our hearts were filled with joy at the sight of the green and fresh leaves on the trees; the frogs drew our attention as we tried to catch butterflies.

    We finally reached home busily playing and laughing with mud-spattered uniforms and shoes. We hurriedly changed our outfits, washed up and sat watching TV with a bowl of hot soup! No doubt, I thoroughly enjoyed this day and secretly prayed for many such days in the future! To this day when it pours, the memories of that eventful rainy day bring a smile on my face!

    A mystery surrounds my grandmother's collection of salt cellars (盐瓶). No one in the family seems to know when she started collecting them, or exactly how many she had.

    My grandmother died just over two years ago. At 91, she had spent 30 years without her right leg, which was removed due to cancer the year I was born. She was a poet, an artist, a food lover and a salt cellar collector. The funny thing about the salts, as she called them — I never once heard her say salt cellar — was that although everybody knew they were her hobby and everyone was always searching for them at yard sales or in stores, nobody seemed to know what they meant to her and they just wanted to make her happy. Grandma kept her salts in a dark wooden corner display case in the living room. Since her death the case has remained exactly as she left it. Grandpa tries his best to preserve his memories of her just as they are.

    Now I am collecting, too. Collecting memories about my grandmother's hobby, a way she spent her time. And as I hold one of them in my hand, I picture her holding it in her hand on the day she got it. She is smiling. My mother and her two sisters all have small collections, but my mother admits that she was more interested in finding salts to send to Grandma.

    Grandma once wrote a poem titled “When April Comes”. The poem contains the line, “When April comes and I am not around, remember me when daffodils are found.” Now, Grandpa is working on a poem with the line, “April came and you were not around”.

    But she was, somehow. She was there in the memories left behind by her possessions.