On a Sunday morning, I was driving down a road and saw something I couldn't believe. A little girl, less than two, was pushing her stroller (婴儿车) across the road. It was Sunday morning and traffic was not heavy.

    I stopped my car at once and ran toward her. This little girl knew enough to run from a stranger. I tried to catch her in order that I could get her out of the road.

    Suddenly her father came running down a hill across the road from where I had parked my car. He ran right to her and caught her up, saying “bad girl” to her. I picked up the stroller and gave it to him. The father grabbed the stroller and walked toward where he came from without a word.

    I went back and sat in my car for a few minutes with my son. My hands were shaking and tears were about to run out of my eyes. “Do you feel cold, Mom?” asked my son. I just shook my head.

    After this happened, I thought about how thankful I am. Even though the father didn't say thank you, I feel that I did something good. Doing something for someone else is pleasing, even when it's only a matter of being in the right place at the right time.

    I didn't really “save” her, but I feel like it was important that I happened to be there. It is sad that I was the only one who stopped. It really made me a little disappointed that no one else stopped to help.

    Finding out what kind and how much physical activity you need

    How do I do it?

    It's your choice. Pick an activity that's easy to fit into your life. Do at least 10 minutes of physical activity at a time. Choose aerobic activities that work for you. These make your heart beat faster and can make your heart, lungs, and blood vessels fitter. Also, do strengthening activities which make your muscles do more work than usual.

    Why should I be physically active?

    Physical activity can make you feel stronger and more alive. It is a fun way to be with your family or friends. It also helps you improve your health.

    How many times a week should I keep physically active?

    It is up to you, but it is better to spread your activity throughout the week and to be active at least 3 days a week.

    How do I build up more physical activity?

    Do a little more each time. Once you feel comfortable, do it more often. Then you can trade activities at a moderate level for vigorous ones that take more effort. You can do moderate and vigorous activities in the same week.

    Controlling your food longings and dropping pounds fast is easy: Just eat break-fast. The editors of Eat This, Not That! Carried out researches to determine some best breakfast foods for weight loss.

    Black Beans

    Protein, per 1/2 cup: 7g

    Black beans will not only fill you up for hours but also help slim you down. Wake Forest Baptist Medical Center researchers found that with black beans consumed daily, study participants' fat reduced by 4 percent over two years.

    Peanut Butter

    Protein, per 2 tbsp(汤勺): 7-8g

    While processed peanut butter is filled with sugar and oils, the real stuff is made with just two ingredients: salt and peanuts. The peanut is filled with heart-healthy monounsaturated(单一不饱和的) fats. Nutritionist and personal trainer Kristin Reisinger suggests using the healthy fat in an AM smoothie.

    Almond Butter

    Protein, per 2 tbsp: 7-8 g

    “Almond butter is high in protein, fiber and monounsaturated fats,” says Martha McKittrick, RDN, CDE." Studies have also shown that people who eat nuts are less likely to become overweight than those who avoid them, likely because it helps you feel fuller.” To get the benefits at breakfast, McKittrick suggests spreading some nut butter on the whole grain toast.

    Eggs

    Protein, per two large eggs: 13 g

    “Eggs are an excellent source of protein and other healthy nutrients including fat-burning choline(胆碱),” says McKittrick. Choline, also found in lean(瘦的) meats, seafood and collard greens, attacks the gene mechanism that causes your body to store fat around your liver(肝脏), according to Zero Belly Cookbook. The more eggs you eat, the less egg-shaped you get.

    Does the future of filmmaking lie in virtual reality (VR) films?

   An ambitious team led by Yale senior Celine Tien might hold the answer to that question.

    Tien produced,directed and acted in Pippa's Pan,which she says is “one of the world's first live-action VR films.”The film,which was completed in April,mixes live action with VR sections.Some of the characters were created via animation（动画）and other techniques that distinguish the film from 360° VR videos like the ones frequently seen on YouTube.

    “360° VR videos are stagnant,which means you don't move with them and see a 360° view of whatever they're filming.”Tien explained.“What we're doing is immersive（沉浸式的）VR.When you put on the goggles (a kind of special glasses) you can physic.ally walk around in the space,pick up objects and engage with the environment.It's a huge difference.”

    The immersive VR film experience is different for everyone who interacts with the medium,but that doesn't mean the film's ending will change for each viewer.

    The film stars two Chinese-speaking actors."It's a love story about a woman suffering from Alzheimer's disease who is trying to bring back memories of her husband,"Tien said.

    The film has already been recognized by the VR industry.After handing in a short demo to the AT&T Developer Summit Conference,Tien and her team were invited to Las Vegas in January,where they came in third place.

    If you're dying to see the film already,your choices area bit limited: Pippa's Pan can't be seen in movie theaters unless they happen to have VR goggles available.According to Tien,many theaters in China will soon have the ability,which makes sense considering China is the film's target market.

    Pippa's Pan will be released in three languages: Chinese,English and Korean.“It can get spread in different ways: at film festivals with VR set ups and through HTC or Oculus headset stores,”Tien says.“If you have VR goggles you can download it and experience it yourself.We will also cooperate with movie theaters that have VR set ups.”

    Next time you make yourself a hot cup of tea or coffee, you might want to let it cool down a bit before drinking.

    Researchers say letting your hot drinks cool off could help you avoid some kinds of cancer. Researchers at the International Agency for Research on Cancer (IARC) found evidence that drinks at temperatures above 65℃, when swallowed, can cause cancer of the esophagus (食道). The researchers examined findings from other studies where tea and coffee were often served at 70℃ or above. Those studies were completed in Iran, China and South America.

    In developed countries, health experts have linked esophageal cancer to smoking and alcoholic（酒精）drinks. However, this form of cancer is more common in areas where people drink beverages（饮料；酒水）at very high temperatures.

    In Europe and the United States, many people drink coffee and tea at temperatures around 60℃.And they often add milk which lowers the temperature greatly. However, tea-drinkers in Iran and mate-drinkers in South America often enjoy their beverages at closer to 70℃.

    The researchers find that South Americans not only drink their mate very hot, they also drink it through a metal straw(吸管). This sends the scalding liquid directly into the throat.

    The findings, however, are good news for coffee drinkers. In 1991, the World Health Organization listed coffee as possibly carcinogenic (致癌的).” The WHO officials have since changed their position on that listing. They now suggest that the temperature of your hot drink is a greater risk factor than the actual drink itself.

    The results suggest that drinking very hot beverages is one probable cause of esophageal cancer and that it is the temperature, rather than the drinks themselves, that appears to be responsible.

    While the start of a new school year is always exciting, this year was even more so for some elementary school students in Auckland, New Zealand. They became the world's first kids to be "taught" by a digital teacher. Before you start imagining a human-like robot walking around the classroom, Will is just an avatar that appears on the student's desktop, or smartphone screen, when ordered to come.

    The autonomous animation platform has been modeled after the human brain and nervous system, allowing it to show human-like behavior. The digital teacher is assigned to teach Vector's "Be sustainable with energy" — a free program for Auckland elementary schools.

    Just like the humans it replaced, Will is able to instantly react to the students' responses to the topic. Thanks to a webcam and microphone, the avatar not only responds to questions the kids may have, but also picks up non-verbal cues. For instance, if a student smiles at Will, he responds by smiling back. This two-way interaction not only helps attract the students' attention, but also allows the program's developers to monitor their engagement, and make changes if needed.

    Nikhil Ravishankar believes that Will-like avatars could be a novel way to catch the attention of the next generation. He says, “I have a lot of hope in this technology as a means to deliver cost-effective, rich, educational experience in the future.”

    The program, in place since August 2018, has been a great success thus far. Ravishankar says, " What was fascinating to me was the reaction of the children to Will. The way they look at the world is so creative and different, and Will really captured their attention." However, regardless of how popular it becomes, Will is unlikely to replace human educators any time soon.