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?

    About twenty of us had been fortunate enough to receive invitations to a film­studio (影棚) to take part in a crowd­scene. Although our “act” would last only for a short time，we could see quite a number of interesting things.

    We all stood at the far end of the studio as workmen prepared the scene，setting up trees at the edge of a winding path. Very soon, bright lights were turned on and the big movie­camera was wheeled into position. The director shouted something to the camera operator and then went to speak to the two famous actors nearby. Since it was hot in the studio, it came as a surprise to us to see one of the actors put on a heavy overcoat and start walking along the path. A big fan began blowing tiny white feathers down on him, and soon the trees were covered in “snow”. Two more fans were turned on，and a “strong wind” blew through the trees. The picture looked so real that it made us feel cold.

    The next scene was a complete contrast (对比). The way it was filmed was quite unusual. Pictures taken on an island in the Pacific were shown on a glass screen (幕). An actor and actress stood in front of the scene so that they looked as if they were at the water's edge on an island. By a simple trick like this, palm trees, sandy beaches, and blue, clear skies had been brought into the studio!

    Since it was our turn next，we were left wondering what scene would be prepared for us. For a full three minutes in our lives we would be experiencing the excitement of being film “stars”！

    It was a morning in January. The jet stream (急流)had dipped down, causing the Arctic cold to reach the mountains of my home. It was only 2 degrees outside, but the cold wind made it feel like it was 15 below zero. Still, I was kneeling in the snow alongside my house trying to open a tiny door, so I eoukl get in. 1 had forgotten to leave my water dripping the night before and now my water pipes were frozen and my faucets(水龙头)were dry.

    The wind cut into me like a knife while I struggled to get two electric heaters in place around the section of frozen pipes. The waterlines were buried except for a small piece that connected up to my house. I put a heater on each side of it, ran the extension cords(软线)into my house and plugged them in. Both heaters roared to life and started blowing hot air on the frozen water pipes. My fingers had already started to go numb, so I stayed inside to wait. I could only hope that this bit of warmth could get my water flowing again. Finally, after twenty minutes, the water started flowing through my faucets again. I went back outside into the biller cold and gathered my heaters up. I looked at the weak January sun shining on the frozen snow and smiled. Then I sent a joy filled with "Thank you" heavenward and returned inside to make myself a hot breakfast.

    Sometimes the coldness of this life can get to us as well. It can make our hearts feel icy and frozen. It can keep our kindness and love from flowing out to others. Sometimes, though, all we need is a bit of warnth to get us going again. It can be a simple smile, a kind word, a heart-felt hug, a morning sunrise, a bird's song or any gentle reminder of just how much God loves us. Let us all be grateful for those bits of warmth that gel us going again. And let us all try to be that bit of wannth for others every chance we get.

    For many of us, our workplace can be dark, depressing and dull. Windowless rooms and airless open-plan floors can kill motivation and cause a loss to worker performance, possibly even their health.

    But a refreshing trend is taking root in workplace design: nature. There's a growing evidence showing that workplaces which include natural elements, such as plants, light, colors and shapes, have noticeable and measurable benefits for both companies and their employees.

    The positive effects touch on everything from worker happiness and creativity to increased productivity, improved profits, and the improved ability to attract the best workers. It's all based on the principle of biophilia(亲生命性) — the born relationship between humans and the natural world and other living systems. And it's easier to achieve at the office than you think.

    “People just don't like using lights in a building with no plants, no views, no natural light,” says Sir Cary Cooper CBE, professor at Lancaster University in the UK. He led a 2015 study on the impact of biophilia in the workplace that surveyed 7,600 workers in 16 countries and found that even small nature-inspired changes can have a great effect.

    Responding to the Human Spaces Global Report, those who worked in environments with natural elements reported a 15% higher level of well-being, a 6% higher level of productivity and a 15% higher level of creativity. One third of them said the design of an office would affect their decisions to work for a company. Even so, 58% said there were no live plants at their workplaces and 47% reported having no natural light.

    An earlier, 2014 study by Cardiff University in Wales also showed that plants in the office make people happier and more productive. But more research is needed into biophilia, experts say.

The Mona Lisa is the famous Leonardo da Vinci painting of a woman with a mysterious smile. This week, the painting gave up a secret.

Scientists used X-rays to examine the chemical organization of an extremely small part of the more than 500-year-old painting. The researchers discovered a technique Leonardo used in the work. A team in France and Britain discovered an oil paint used for the Mona Lisa was a special, new chemical mixture. It suggests that the Italian artist may have been in an experimental mood when he set to work on the painting early in the 16th century.

"He was someone who loved to experiment, and each of his paintings is completely different technically," said Victor Gonzalez. He is the study's lead writer. "In this case, it's interesting to see that indeed there is a specific technique for the ground layer of the Mona Lisa," he said in an interview with The Associated Press. Specifically, the researchers found a rare compound, plumbonacrite (水蛭石), in Leonardo's first layer of paint. The discovery, Gonzalez said, proved that da Vinci most likely used lead oxide to thicken and help dry his paint.

The scientists looked into its atomic structure using X-rays in a synchrotron (同步加速器). The machine moves particles at close to the speed of light, permitting researchers to look deeper into the paint structure. "Plumbonacrite is really a fingerprint of his recipe," Gonzalez said. "It's the first time we can actually chemically prove it."

Dutch artist Rembrandt may have used a similar mixture when he was painting in the 17th century. Gonzalez and other researchers have found plumbonacrite in his work, too. "It also tells us that those recipes were passed on for centuries," Gonzalez said. "It was a very good recipe."

But the Mona Lisa and additional works by Leonardo still have other secrets to tell. "There are plenty, plenty more things to discover," Gonzalez said. "What we are saying is just a little brick more in the knowledge."

Max Du emerged victorious at the Canada-Wide Science Fair with an innovative project that could revolutionize emergency response: a drone designed to assist individuals experiencing cardiac arrest. His creative spark was ignited during the Christmas break of the previous year when he received a toy drone from his parents. Due to the snowy conditions, Max was unable to fly his new gadget outdoors, prompting him to explore its potential as an indoor robot that could be of service to people in need.

In Canada, approximately 35,000 individuals suffer from cardiac arrests annually, with the majority of these incidents occurring outside of hospital settings. Sadly, less than 10 percent of these individuals survive. Max was convinced that a drone could provide more rapid assistance and deliver life-saving medication, but he knew he had to construct one himself to validate his hypothesis.

The process of testing his drone spanned six months, during which Max's parents had to tolerate their son's persistent drone flights and mishaps within their home. Each innovative feature Max developed, such as a deployable arm, added weight to the drone, causing it to disintegrate. This necessitated the purchase of new components. Through experimentation, Max eventually discovered a more lightweight material, leading to a better-balanced design.

After a series of trials and adjustments, the 14-year-old successfully perfected his drone. It is now capable of opening door handles, navigating through the air, and landing gently on the ground. The drone features a new extendable arm designed to administer injections or deliver crucial medication to a patient. Additionally, an integrated camera allows for direct communication with an emergency response team, enabling remote monitoring of the patient.

Max is looking forward to filing for a patent to establish connections within the healthcare sector and bring his invention to fruition. He spent his summer acquiring knowledge in artificial intelligence at Stanford University in California, where he was one of only 32 students chosen globally. Following this, he will attend the University of Pennsylvania to enroll in a college-level robotics course before resuming his high school studies in September.