Larry Ritsema was out for an early morning jog around his neighborhood one day. On a quiet street, he began to feel weak. Suddenly, everything went black. Larry fell to the ground.

    Less than a minute later, Tom Alguire passed by on his bicycle. He caught sight of a man lying on the roadside, so he jumped off his bike and ran over. He recognized Larry immediately, because he had been Larry's doctor for nearly 20 years.

    Dr. Tom felt for a pulse (脉搏) at first. Finding none, he began to give Larry first aid. It wouldn't restart Larry's heart, but it would keep the blood flowing until someone else arrive d. Tom could only hope someone would come by soon, at around six o'clock in the morning on a holiday weekend. Tom couldn't stop pressing Larry's chest to run for help — Larry's brain cells would die without the blood. And Tom didn't have a cell phone with him.

    Soon, a car did drive by. But the driver ignored Tom's appeal for help. What was he going to do? Tom was very worried. Finally, another car came down the road, driven by Michael Saliot, a U.S. Coast Guard Officer. Michael wasn't one to pass up a chance to help a person in need. He quickly dialed 911.

   Doctors then found that Larry had suffered a heart attack and there were severe blockages in two of Larry's major arteries (动脉). Only the timely arrival of Dr. Tom saved his life.

   How did Dr. Tom happen to be bicycling that morning, down that quiet street? It turned out that as Tom rode, his bike chain fell off. He spent about eight minutes fitting it back; otherwise, he would have seen nothing of Larry's problem.

    Every year, billions of kilograms of fresh produce are wasted in the United States. Meanwhile, millions of poor Americans go hungry, without access to healthy and affordable meals. Evan Lutz, CEO and founder of Hungry Harvest, was inspired to act after seeing extreme poverty in areas of Baltimore, Maryland. He wants to reduce the so—called food waste in that area. His work is to make sure no food goes to waste and no person is ever hungry in America. And he combines that goal with a love for business.

    Hungry Harvest is a business which collects and sells fruits and vegetables that most food companies will throw away. Everything doesn't grow the same way on a farm. But all that is too big or too small gets thrown out. That is why everything in a grocery store looks similar. Hungry Harvest will box those imperfect ones and deliver them to customers once a week.

    For every purchase, Hungry Harvest delivers healthy food to people in need. Hungry Harvest has recovered 300,000 pounds of produce to date and provided 100,000 pounds to those in need.

    Lutz established Hungry Harvest in 2014.Its success depends on team work. Every week on Monday or Tuesday they will decide what will go into the next week's box by calling up packing houses and wholesalers to see what they will normally throw away that week. They then place the order. The last step ls to send goods to customers.

    In January 2016,Lutz appeared on the American business competition television show "Shark Tank" and got even more than he expected: $100,000.Lutz is using the money to expand. Actually, more than six billion pounds is wasted each year due to "ugly" surface. Hungry Harvest is on the way to saving more food from going to waste and feeding hungry families.

    Leaving Hanoi on a fiercely hot summer day,after an hour by air,Luang Prabang gradually appears below our airplane wings.From a few hundred meters above,my first impression of this UNESCO-listed heritage（遗产）is an area of green land and mountains,surrounded by snaking rivers.

    Encircled by mountains,the former royal capital of Luang Prabang is more than just the country's picture-perfect showpiece.

    Travelers will be attracted to Luang Prabang by the city's timeless peacefulness with its shiny Buddhist temples, French colonial architecture and friendly people.

    Tourists visiting Luang Prabang shouldn't miss the chance to see one of the most sacred（神圣的）Lao traditions, tak bat,or the Buddhist almsgiving ritual（仪式）,which dates back to the 14th century.

    As the sun rises in Luang Prabang,hundreds of Buddhist monks depart from their temples to gather their daily offerings,which most commonly are rice,fresh fruit and traditional sweet snacks.The daily alms gathering begins on the main street before spreading to all the side streets.

    Our group of six got out of our comfy beds at 5 am to join other local residents and tourists to offer alms to the monks.We kneeled by the roadside in front of the 3 Nagas Hotel on the main street with big baskets of steamed sticky rice,waiting quietly until monks of all ages passed by to accept our gifts.

    The daily ritual gives you a wonderful opportunity to experience an ancient Lao tradition.However,there are some strict rules if you wish to join the event.

    Firstly,shoulders,chests and legs must be covered in modest clothing as a mark of respect.You should also remain a suitable distance from the monks.Photographs may be taken,but from a distance and never use a camera flash.The ritual has to be performed in silence.Talking to or touching the monks at any time,even when making an offering,is not allowed.

    Another must-do morning activity is to visit the local market,where you can see the generosity that Mother Nature offers this dreamy land.While walking through the morning market,located within a long and narrow hamlet,I was excited to see all kinds of products from the nearby river and jungle: some ill-fated squirrels lying next to fresh bamboo shoots,different kinds of wild mushrooms and vegetables displayed on banana leaves and giant river catfish in baskets.

    Although Luang Prabang is small,there are many things to see here.Active travelers can get up close and personal with Laos' gentle giants at the elephant conservation camp or take in some scenes of riverside life with a cruise or kayak excursion on the rivers.Two waterfalls that are perfect for picnicking in the foothills nearby,and classes are available in traditional crafts.

    Social media is one of the fastest growing industries in today's world. A study conducted by the US Pew Research Center showed that 92 percent of teenagers go online daily. The wide spread of social media has changed nearly all parts of teenagers' lives.

    Changing relationships

    High school student Elly Cooper from Illinois said social media often reduces face- to-face communication. “It makes in-person relationships harder because of people's attention given to their phones instead of their boyfriends or girlfriends,” Cooper said.

    Yet, some people believe social media has made it easier to start relationships with anyone from anywhere. Beth Kaplan from Illinois met her long-distance friend through social media. He currently lives in Scotland, but they're still able to frequently communicate with each other. “I can feel close to someone that I'm talking to via FaceTime,” Kaplan said.

    Wanting to be “liked”

    The rise of social media has changed the way teenagers see themselves. The 19- year-old Essena O'Neill announced on the social networking service Instagram that she was quitting social media because it made her unable to stop thinking about appearing perfect online. Negative comments also can do great damage to a teenager's self-esteem. Teenagers who get negative comments can't help but feel hurt.

    Opening new doors

    However, Armin Korsos, a student from Illinois, takes advantage of the comments he receives over social media to improve his videos on the social networking site YouTube. “Social media can help people show themselves and their talents to the world in a way that has never been possible before,” Korsos said.

    What would it be like to live on Mars? Volunteers are spending eight months in an area that looks much like the surface of Mars. They are isolated(孤立)high on top of Mauna Loa, a volcanic mountain on the Big Island of Hawaii, living on a simulated(模仿的) or make-believe, Mars Base.

    The project called HI-SEAS is in the charge of Kim Binsted. She says this wild environment is as close to Mars as you can find on Earth. Because it is so high, the land is not warm or rich with plants, like the rest of Hawaii.

    "You will see there is really no visible plant life or animal life. And you have got this wonderful volcanic material."

    Mauna Loa, 2,500 meters above sea level, is geologically very similar to Olympus Mons on Mars and almost as tall as the Martian mountain. When measured from its base, deep in the ocean, Mauna Loa is the second largest mountain in our solar system, after the one on Mars.

    The six member HI-SEAS crew is mostly self-sufficient. Food and supplies are brought to them. But the individuals bringing those supplies cannot communicate with volunteers inside the habitat, or base.

    Kim Binsted says this experiment looks at how the astronauts get along with each other. "We study how well they work together, how we can keep them happy and supported, and not wanting to kill each other over these long durations (期间)."

    Crew members communicate with the outside world through e-mail and blogs. They also produce video on the YouTube website, like this one from mission commander Martha Lenio. "I am really enjoying this opportunity to live here and pretend that I'm on Mars and get to learn all sorts of new skills." One of them said. "Whoever gets there first, the trip will not be easy", says Kim Binsted, "It is going to be challenging."

    If you're feeling overwhelmed by all the features and apps available on smart phones these days and miss the good old days when mobile phones were simple communication tools, you'll probably love Light Phone 2, a stylish " dumb phone" designed to remove time-wasting distractions(使人分心的事物) from your life.

    The original Light mobile phone could only be used to make and take phone calls, but its creators recently decided that in order to improve its usefulness while still keeping users safe from smart phone distractions, it needed a few extra features. They recently announced Light Phone 2 is just as tiny and stylish as the original ones, but also features text messaging functions and an alarm clock.

    Data from company Flurry shows that people in the US spend around five hours a day on their smart phones, while a study from the firm Asurion found that Americans check their phones an average of 80 times per day. Those are some pretty alarming numbers, and to make matters worse, scientists report that too much screen time has a bad effect on our brains, especially those of children.

    Light Phone 2 will never replace your Apple phone, but it can at least help you mitigate the effects of smart phone addiction by allowing you to "go light" every once in a while. You can stay in touch with the important people in your life, but you'll be free from the apps distracting you from the wonders of the colorful world.

    But becoming free of smart phone distractions doesn't come cheap. The Light Phone 2 is expected to be priced at around $400, which is far more expensive than some smart phones. However, a lot of people seem to think the phone and what it promises to do are worth the price, as evidenced by the success of Light's latest crowd funding(众筹) campaign. With 24 days left until deadline, the company has already raised $360,000, blowing past its $250,000 goal.