【推荐1】George Mason University looks like any other big college with its tall buildings, student housing and green lawns (草坪)—except for the robots.

This Northern Virginia university recently set up several dozen meal delivery (递送) robots from Starship Technologies to make it easier for students to get food.

Many colleges across the country have set up delivery robots—including University of the Pacific in Stockton, California, and Northern Arizona University—but George Mason University is the first college in the United States to include robots in its student dining plan. The school is partnering with food service provider Sodexo for the program.

"We were amazed by the volume of orders (订单量) that we had when we turned the service on," Starship Technologies manager Ryan Tuohy says. "But what's really touching is how the students in the university have accepted the robots."

Student Grace Pereira-Plaza says she finds the robots "pretty cute" and at first students were crazy about them - taking pictures, dressing them up for holidays. But they slowly got used to them. “We find it normal now. When we see them go by, it’s like ‘Oh there they are,”" Pereira- Plaza says.

How does it work? Students can place an order through an app for food from any restaurant that is part of the program. The cost is $1.99 per delivery. Then, they wait. The goal: a 30- minute delivery. Students can watch robot as it travels toward them- at 4 miles an hour.

The robot is equipped with nine cameras and sensors to navigate (导航) its surrounds. Humans are still needed to put the food into the robots and they can monitor (监控) them from far away and step in if there are any problems. But these are self-learning machines that can adapt. So, if they see a student start across the road they’ll know what to do, "Mark Kroner, head of the school's food operations, says. " So they are learning and its fun to watch them progress. "

【推荐1】Senior high can be a very hard time for students. These tips can help keep high school stress at a minimum before it becomes too hard to handle

Get organized. By becoming more organized, you can reduce your stress level. Make a daily schedule of all your activities. Another way to become more organized is by getting your supplies and desk in order. Arrange your notes and assignments by topic or date so you can easily find information.

Don’t put off. Delaying doing your schoolwork will only make you more stressed. If you get an assignment that is due in a month, and you don’t have any other assignment to finish, go ahead and begin working on it.

Exercise. Performing some sort of physical activity for thirty minutes three times a week will largely lower your stress level. Taking the time to exercise will help get your mind off the stress in your life.

Get plenty of sleep and eat healthily. You need between seven to eight hours of sleep per night in order to rest your mind and body so they can perform well during the day. Eating well-balanced meals will provide you with enough energy to finish your daily activities.

Take a positive attitude. If you are always negative, then stress will control you. By looking at things in a positive light, you will not only reduce your stress, but you will also feel better about yourself.

Realize that it’s okay to say “no”. If you already have a full schedule, don’t attempt to add anything else to it. If your friends want you to go out at the last minute but doing so would conflict with your schedule, don’t feel bad about turning them down. They will understand. They have been stressed before too.

【推荐3】Scientists from the National University of Singapore studied how much time twins spent in natural spaces compared with each other and found that they shared a similar level of desire to be in nature.

“The reason we decided to study this in twins is that we could estimate heritability(遗传性)based on the genetic similarities in identical twins(100%)versus genetic similarities in non-identical twins(50%),” said Chia-chen Chang, who led the study. “If a trait(特性), such as the desire to be in nature, is clearly more similar between identical twins than non-identical twins, this will then suggest a trait is heritable.”

Using the TwinsUK registry, researchers surveyed 1,153 pairs of twins—identical and non-identical—about how they experienced nature. They were required to answer questions involving how frequently they visit natural spaces such as public parks and private gardens and rate their familiarity with nature. After comparing and analyzing the collected data, researchers found that identical twins were more similar to each other in their attitudes towards nature.

While previous studies have found that spending time in natural spaces improves mental well-being, this varies from person to person. For the first time, the researchers say, this study has indicated why that is by suggesting there is likely to be a genetic component in our preference for nature and our likelihood to visit natural spaces.

However, heritability declined with age, perhaps showing that environmental factors such as access to nature and green spaces bring about a love of the outdoors as one grows older. That is to say, a person's desire to be in nature and how often they experience it are influenced by both genes and personal experiences. Those who live in urban environments without access to nature could end up having a lesser appreciation of it. Hence, it's necessary that diverse urban planning is needed to provide access to natural spaces-and the benefits they offer—for all.