2 . While screen time is known to affect sleep, new research suggests that interactive (互动的) activities, such as texting friends or playing video games, put off and reduce the time spent asleep to a greater degree than passive (被动的) screen time like watching television, especially for teens.

The team studied the daytime screen-based activities of 475 teenagers using daily surveys. They asked the teens how many hours they had spent that day communicating with friends through social media and how many hours they spent playing video games, surfing the internet and watching television or videos. Finally, the researchers asked if they had joined in any of these activities in the hour before bed.

Next, the team measured their sleep time for one week. The researchers found that the teens spent an average of two hours per day communicating with friends via social media, about 1.3 hours playing video games, less than an hour surfing the internet and about 1.7 hours watching television or videos. For every hour throughout the day that they used screens to communicate with friends, they fell asleep about 11 minutes later averagely. For every hour to play video games, they fell asleep about 9 minutes later. Those who talked, texted or played games in the hour before bed lost the most sleep: about 30 minutes later.

Interestingly, David, lead author of the study, said the team found no obvious relations between passive screen-based activities and sleep. “It could be that passive activities are less mentally exciting than interactive activities,” said Anne, co-author of the study. “It’s a tricky situation,” she said. “These screen tools are really important to everyone nowadays, so it’s hard to put a limit on them, but if you’re really looking out for a teenager’s health and well-being, you might consider limiting the more interactive activities, especially in the hour before bed.”

“No matter how hard we try, some things are just not meant to be,” Andrew thought bitterly. He looked down at the hospital bills in his hands and tears filled his eyes. His poor mom had been so ill, and here he was complaining and feeling sorry for himself! He should be praying for her recovery, not crying over a lost, childish dream.

Andrew was nineteen, and as far back as he could remember, he’d wanted to become a software engineer. That dream had become harder to reach after his dad died when Andrew was twelve. His mom had been left to raise him on her own, and it was hard to make ends meet. So Andrew started doing part-time jobs.

Every cent he earned he put away for college. When he was sixteen, he got himself a summer job at a local IT company, where his insight and intelligence caught the owner’s eye. Mr. Lewis, the CEO, made Andrew the assistant of his best and most innovative developer, and the boy thrived (不断成长) on the challenge. He couldn’t wait to go to college!

Unfortunately, when Andrew was in his senior year in high school, his mother became very ill. The usually energetic woman was constantly tired and in pain. She went from doctor to doctor, but no one knew exactly what was wrong with her. They sent her off to do dozens of expensive tests, then shook their heads over the results. Andrew’s mom started getting weaker and weaker, and thinner and thinner until she could barely walk.

Andrew added up the medical bills and was shocked. They owed over $23,000! Andrew pulled out his bank book. He had close to $30,000 in his savings account. He’d painstakingly (艰苦地) saved up for YEARS, so he’d be able to go to college, but his mom’s health was more important.

4 . You see a shopper trip over in a busy street. Someone else can help. That’s what you tell yourself. This is the bystander effect in action — the dilution (淡化) of responsibility in the presence of others — and it has been demonstrated in many past studies.

But life is complicated and psychologists have seen exceptional circumstances. Two experiments were conducted by Marco van Bommel and his team using an online chat room for people with extreme emotional problems. Eighty-six students were logged into the forum (论坛) and shown five messages from troubled users. They were told to write a reply if they wanted, but it was entirely up to them.

Basically, participants could see their names on the screen alongside others’ names. A counter also told them if the forum was quiet, with just one other person logged in, or busy, with 30 others online. This arrangement reproduced the classic Bystander Effect-participants were less likely to post replies with more people logged in. However, when the researchers cued (提示) self-awareness by highlighting participants’ names in red on the screen, they posted more replies on a busy forum.

A second study was built on these findings, but this time self-awareness was raised by the presence, or not, of a computer web-camera. Over 100 participants took part. Although told the camera wouldn’t be used until later, those with cameras were asked to check the camera’s indicator-light during the study. The Bystander Effect was reproduced when web-cameras were absent-on busy forums participants posted fewer replies to needy users. By contrast, those cued to be self-aware by the web-cam actually wrote more replies.

Nearly any online community can benefit from the research. The ability to turn hesitant bystanders into eager helpers is a recipe for engagement and collective benefit. As in the research, simple design cues could be integrated to help online users remember they are visible to the community. For example, the size of profile images and specific on-site reminders can be used to highlight how users see themselves within the community.

Students’ Time Spent on Physical Exercise Weekly

Nowadays, many students are aware of the significance of physical exercise, although the time they spend on it varies.

7 . When delivering medications to patients, one of the most effective methods is direct injection (注射) into the bloodstream using a needle. But this can be an uncomfortable experience, especially for kids or adults with a fear of needles. While patients do have the option to take oral pills instead, drugs containing large molecules (分子) are not absorbed effectively this way.

Now, inspired by octopus suckers (章鱼吸盘), researchers from China and Switzerland have designed a needle-free alternative: a tiny, drug-filled, cup-like patch (贴片) that sticks to the inside of the cheeks. The device is easily accessible, and it can be removed at any time and the drug gets absorbed through the lining of the inner cheek, the team reports in a paper in Science Translational Medicine.

To test the design, the team 3D printed the suckers. They loaded each with the drug and stuck them inside the cheeks of three beagles, a kind of dog which has a similar inner cheek lining to humans. For comparison, they also delivered the drug to beagles via a pill. After three hours, the team found that drug blood concentrations in dogs with the patch were more than 150 times higher than in the dogs that took a tablet. They also found patches worked effectively for drugs with large molecules.

40 healthy human volunteers self-applied water-filled patches to see how well they would stay on while talking and moving their mouths. After 30 minutes, only five of the 40 patches had fallen off, which was because of improper placement. Most volunteers said they would prefer a patch over injections for daily applications.

Still, the team only tested the patch for a short time so they would need to find out what would happen if it was used repeatedly. They’d also need to determine which drugs would work with the technology: the target is large molecules, such as those used to treat obesity or osteoporosis, but they can’t be too large to fit in the cup.

8 . Harry Burleigh headed into the woods for a camping trip with his fishing equipment. A few days later, his wife Stacy grew _________ when he didn’t come home as planned.

Stacy called the _________ to report her husband’s missing. Search and rescue teams _________ began their work and went on for days, but there was no _________ of Harry anywhere. Everyone was worried — the temperatures were quite low some nights, and it had even snowed.

On May 15, the rescuers finally caught a break when they _________ a shelter and his fishing equipment. They _________ support from over 16 rescue organizations, and they explored every possible _________ but with no luck. Therefore, the rescuers _________ him a lighter and a note telling him to make a _________ and they would be back. Two days later, a team found another __________, but this time, Harry was nearby and heard his name called! It turned out he was __________ along the path with minor pain.

__________, the crew radioed for a helicopter to take him to the hospital for a complete evaluation after spending 17 long days out.

“This was the __________ we all have been looking for in this case,” a rescuer said. “It is our __________ search and rescue teams and the partnerships we have with other teams that helped __________ Mr. Burleigh and his family.”

Xi’an, capital city of Shaanxi, served as the capital of 13 dynasties in Chinese history, which in total     1    (last) about 1,100 years. Consequently, the ancient history of Shaanxi is to some degree the ancient history of China. Shaanxi History Museum considers     2     a duty to be a showcase of Chinese ancient civilization.

People call Shaanxi History Museum “Bright Pearl in Ancient Capital and Precious Treasure of China”, for it is an art palace     3    (full) showing Shaanxi history and culture as well as Chinese ancient civilization. Its architectural buildings and exhibits have made it famous as a first-class museum in China     4     it was opened to the public in 1991. It covers     5     total area of 65, 000 square meters.

The basic halls in the museum are divided into three exhibition halls     6     2,000 cultural remains to display the history of ancient times in chronological (编年的) order. The first exhibition hall     7    (locate) on the ground floor while the other two are on the second floor.

While     8    (design) the buildings in Shaanxi History Museum, the great designer used     9    (tradition) palace construction of Tang Dynasty for reference. Adopting symmetry axis (轴对称) layout with main and supporting buildings in order, the complex     10    (architecture) show the unique presence of Tang Dynasty.

10 . 3M and Discovery Education announced Sean Jiang from Gilman School as one of the top ten finalists from across the nation for the 2023 3M Young Scientist Challenge. It’s a competition that encourages students to identify an everyday problem and submit a video showing the science behind the solution he or she came up with.

14-year-old Jiang decided to help those who can’t see. Blind people had a hard time navigating (导航) objects that are medium to far range. So Jiang wanted to design something to give them a heads-up on obstacles (障碍) that may be incoming.

Jiang’s inspiration came from the powers of the hearing system. “I learned in school that bats and whales are able to use echolocation (回声定位) to help them navigate and just use their sense of hearing and I also saw on YouTube some very skilled blind people that use echolocation to help them walk,” said Jiang.

Jiang started with a virtual reality setting and then made it a reality. His creation uses a depth camera that can detect how close objects are, thus giving enough time to dodge the obstacles. When a blind is walking with the device, the sensor of the depth camera gathers the information regarding the obstacles’ position and distance. Then the AI system in it will turn the distance data into musical sound guidance. This could significantly increase the walking speed of a blind person as well as decrease the number of obstacles they hit.

Some other similar programs were alright at finding objects that were in close range, but Jiang still wanted the blind to experience the world even fuller so they were able to see stuff that was much further away than their circle of reach.

In October, the top ten finalists will compete in person in Minneapolis for the title of “America’s Top Young Scientist” and a $25, 000 prize.