Winslow Homer was a famous American painter. Since Art History class in college, I had always admired his works and I was lucky to see a large exhibition of his works when I was in my early 30s.It was at this event that I bought a print of his painting, “Snap the Whip”. It always hung in my classroom until I retired from teaching.

    I thought it truly captured the freedom and fun of childhood. In the painting, a group of young boys are playing a game arm in arm on grass ground in front of a farm house. They are jumping and laughing wildly with great joy. One of the boys is falling down to the ground. They are not even wearing shoes!

    During my last year of teaching, there was a young woman in her first year of teaching right next door to me and we got to be good friends. She had been an art student before taking up education. Her eyes were drawn immediately to this print when she entered my room. So on my last day of teaching, after the students had left, I took the painting off the wall and walked next door and gave it to her.

    She was really surprised, but very glad to have it. I was delighted that she liked it and all the students she would have would treasure it as much as I had. We found the perfect place for it on one of her walls and hung it together. I was happy that she brought back this wonderful memory for me.

    Sitting has been called the new smoking for its supposed Public health risks, especially for people with sitting down office jobs. Over the past 15 years or so sitting has been connected with heart disease and diabetes (糖尿病). But is sitting really that risky?

    In our latest study we examined if not only the total amount of sitting, but different types of sitting, were connected with developing type 2 diabetes. We wanted to see if there was any difference among sitting watching TV, sitting at work, or sitting at home but not watching TV.

    We studied sitting habits of 4. 811 middle-aged people, who didn't have diabetes or heart problems at the start of the study. Over the next 13 years, 402 people developed diabetes. Once we considered obesity (AE RF), Physical activity, and other things that may develop type 2 diabetes, neither total sitting time, sitting at work nor sitting at home but not watching TV were connected with developing diabetes. We found only a weak connection with the time spent sitting watching TV and an increased risk of developing diabetes.

    This is different from the results of five older TV studies that showed a stronger connection. But hardly any of the included studies mentioned obesity, a major cause of diabetes.

    For people who are physically inactive, though, the story's different. Two recent studies show the total time spent sitting a day is connected with developing diabetes, but only in people who are physically inactive or both physically inactive and obese.

    That's not the whole story. At least two things determine if sitting is a risk factor in its own right: the type and situation of sitting.

    For example, sitting down at work isn't strongly connected with long-term health risks, Perhaps that's because higher position jobs needs more sitting, and higher socioeconomic (社会经济) position is connected with a lower risk of disease. It's a different case for sitting watching TV, the type of sitting most possibly connected with long-term health risks. People who watch a lot of TV tend to (a) be of lower socioeconomic positions, unemployed, have poorer mental (精神上的) health, eat unhealthy foods and face more unhealthy food advertising.

    The summer I turned 16, my father gave me a car, which permitted Hannah and me to drive around Tucson whenever we wanted to.

    Hannah was my best friend. "Hannah's amazing," my mother always said. And sure enough, that summer she signed with a modeling agency. She was already doing runway work.

    One day, Hannah and I went to the movies. On the way home, we stopped at the McDonald's drive-through, putting the fries on the seat between us to share. "Let's ride around a while," I said. It was a clear night, moonlight shone over the desert. Taking a turn too fast, I hit a patch of dirt and fishtailed.

    French fries on the floor. An impossible amount of blood on Hannah's face. They took us in separate ambulances. In the ER, my parents spoke quietly Best plastic surgeon in the city. End of her modeling career.

    We'd been wearing lap belts, but the car didn't have shoulder harnesses. I'd cracked my cheekbone: Hannah's forehead had split wide open. What would I say to her?

    When her mother, Sharon, came into my hospital room, I started to cry, bracing myself for her anger. She sat beside me and took my hand. "I almost ended my best friend when I was your age," she said, "I totaled her car and mine."

    "I'm so sorry," I said.

    "You're both alive," she said, "The rest is window dressing." I started to protest, and Sharon stopped me. "I forgive you. Hannah will too."

    Sharon's forgiveness allowed Hannah and me to stay friends throughout life. I think of her gift of forgiveness every time I want to resent someone for a perceived wrong. And whenever I see Hannah, the scars are a symbol of grace for me.

ChatGPT, a new chatbot model! Developed by Open AI, has quickly become a hit all over the world because of its powerful conversational abilities.

It can write emails, computer codes (代码), songs, poems, and even short stories, and has passed a number of tests within seconds. Experts around the world are discussing whether AI should be used in education. Some schools have banned(禁止)it. The New York City's Department of Education, for example, banned ChatGPT from its public school networks, and some people are warning that it could encourage more students to cheat, especially in exams.

Many more welcome this app, saying that, like most technologies in history, ChatGPT is a powerful tool for the development of education.

Accepting AI as early as possible is a good choice. Schools should make preparations for including AI in their teaching plans. They can start by offering Al courses, because by understanding how it works, they can make better use of it. Besides, students with good knowledge of AI are more competitive when it comes to getting a job, as an increasing number of jobs are being done by computer programs. AI powered education technologies can be used to make the learning experience more suitable for each student. As for teachers, AI can free them from doing some boring work so they can focus on their teaching.

Since we cannot avoid ChatGPT and other AI powered apps from entering the field of education, we should make efforts to make sure they have a positive impact(积极影响)on society and the future of education. AI helps to make learning much more interesting and enjoyable, but humans need to work very hard to win the race with technology. 

 "A moth (飞蛾) to a flame" is often used to indicate an inescapable attraction, yet it is a strange example of animal behavior that continues to confuse people today. Scientists have raised a number of theories over the years to explain why. One holds that insects flying at night are following their nature to fly toward the brightest spot in their field of vision, which they mistake for the sky. Another suggests that insects are trying to warm themselves with the heat produced by the light. The most popular theory, though, is that insects are confusing lights with the moon or other celestial bodies (天体) that they normally use to navigate (导航).

To find out the real reason, the team carried out a first set of experiments in an insect flight area. The researchers used eight high-speed infrared (红外线) cameras equipped with motion-capture technologies to track 30 insects from three moth and two dragonfly species. They also flew lab-raised insects from six different insect orders that were too small for motion-capture technology, including fruit flies and honeybees, to make sure different insects all showed similar responses to light. Working with co-author Pablo Allen of the Council on International Educational Exchange in Monteverde, Costa Rica, the researchers put heavy cameras, lights and tripods in two field sites to gather behavioral data from insects in the wild.

The team was able to confirm that insects were not beelining to the light but rather circling it as they tilted (倾斜) in an attempt to turn their backs toward it. This behavior, known as a "dorsal light response", normally helps insects to remain in an unchanging path of flight that is properly lined to the horizon (地平线). Artificial light that arrives from a point source causes them to fly in unpredictable patterns as they try to turn their backs to what they are mistaking for the sky.

Now research might have finally solved the mystery mentioned first: artificial light confuses insects' ability to turn themselves to the horizon, confusing their sense of what is up and down and causing them to fly in circles.