【推荐1】Have you ever experienced such an annoying thing as it took so long to open a web page? You're watching stops every few minutes, which ruined your internet experience. But it could be a thing of the past. On June 3, the Ministry of Industry and Information Technology announced that China would issue licenses for the com- serialization of 5G. It means major telecom carriers will start to provide 5G services.

The “G” in “5G” refers to the generations of mobile network technologies. 1G let us talk to each other,2G let us send messages, 3G gave us mobile data and the internet, and 4G made all of these things faster.

Now 5G promises much faster data download and upload speeds, and more stable connections. This means that you will be able to download an entire HD movie in seconds and only experience a short delay between sending and receiving data. For example, when you have a video chat with your friend, there is generally a 100 to 200 milliseconds(毫秒) delay with 4G,but 5G will reduce the delay to 1 millisecond or less, which is almost real time.

With a 5G network, the short delay in information exchange will allow driverless cars to run more safely, as they will be able to communicate in real time and avoid potential dangers. Meanwhile, 5G-enabled wearable devices will keep doctors constantly updated on the health status of their patients and warn them immediately if there's something wrong. Besides, VR games will become more popular with 5G. The short delay of 5G will make the games feel even more real.

Though 5G will make our lives more convenient, it will not be perfect. For one thing, 5G will not “travel” far. On 4G networks, you can be 10 kilometers away from the nearest transmission(传输)base and barely lose signal. But 5G will only cover about 300 meters, meaning we will need more transmitters so that we can get signals. And in order to use 5G, we will have to buy new products specially designed for 5G that are currently expensive.

【推荐3】Electrical devices (电子仪器) could soon use power made by human energy. Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking, British scientist Max Donelan and other scientists in Canada and the United States developed the device.

The device connects to a person’s knee. As the person walks, the device captures energy each time the person slows down. To do this, the device helps with the slowing down movement of the leg, the movements of the walking person push parts of a small machine that produces electricity. Using the device, an adult walking quickly could produce thirteen watts of electricity in just a minute. Donelan says walking at that speed could produce enough power to operate a laptop computer for six minutes.

There are several possible uses for the device. Developers say it could help people who work in areas without electricity to operate small computers. The device could also be used in hospitals to operate heart pacemakers (起博器), and it could even be used to assist in the movement of robotic arms and legs.

The experimental version of the device weighs about one and a half kilograms, but it is too costly for most people to buy, but the researchers hope to make a lighter, less costly version. An improved version should be ready in one year.

The developers hope the device will one day help developing countries; nearly twenty five percent of people around the world live without electric power.

A similar product was invented in 2005 by Larry Rome of the University of Pennsylvania. He created a bag carried on a person’s back that also produces power from walking. The knee device does not produce as much electricity as the bag, but the bag requires the walker to carry a load of twenty to thirty kilograms.

【推荐1】Cal Fire captain Shawn Raley barked evacuation (疏散) orders over the radio for the neighborhood of Sunset Terrace. The sky was red and the wind screamed. New fires lit in bushes and on roofs. Raley, a 24-year veteran of wildland fires, had seen nearly everything, including swirling eddies of air called fire whirls. But he hadn’t seen anything like this.

At around 7:15 p.m., he drove toward areas in the wooded hills. He figured that residents would need help escaping. His headlights barely pierced the smoke, but he could see three bulldozers (推土机) inch past him on two-lane Buenaventura Boulevard. Don Andrews drove one; Terry Cummings and Jimmie Jones drove the other two. They were under swaying electrical line, and Raley shouted at them to move away.

In the driveway of a house, Raley spotted a Tesla with someone in the driver’s seat. Dr. Thiruvoipati Nanda Kumar had raced eight kilometres home from Vibra Hospital. His wife, Yasoda, and daughter, Sushma, hadn’t received an evacuation alert, and when the power cut out, their garage door wouldn’t open. locking their car inside.

“Go back!” Raley shouted at Kumar, sounding his siren.

“My wife and daughter are there. Can they come in? Kumar said, pointing to Raley’s vehicle. He figured they’d be safest with the captain.

“Come in my truck?” Raley asked. “Yes.”

The women jumped into the back seat, coughing. Nearby, flames that climbed 30 meters burned their neighbors’ homes. Soon theirs would fall, as well.

“I’ll lead you out,” Raley yelled to Kumar. “Take your car.”

Debris (碎片) attacked the truck, cracking Raley’s windshield and breaking the other windows as the wind blew the vehicle off the road. The captain threw himself across the passenger seat, protecting his face as the fire passed over them. Yasoda and Sushma screamed.

“Are you okay?” Raley shouted, though he knew the answer. He was embarrassed. He’d told this trapped family that he would get them out safely. Now they were covered in glass and bleeding. Behind them, the trunk of Kumar’s Tesla was a flame.

【推荐2】“The first step in realizing your dream is to not be afraid of any challenge,” Liu Wa from Bejing Chaoyang Kaiwen Academy said.

This July, when Liu was informed that the music festival her band was attending had some trouble and was about to be cancelled, she decided to take over the job of hosting it. “I thought to myself, how hard could hosting be?” What’s more, she turned this festival into a charity event by raising money for a stray dog rescue station in Anhui province.

Liu became a volunteer for the station by coincidence two years ago. “I realized how much money it could take to save those dogs. This music festival is exactly the opportunity I need to raise people’s awareness of protecting stray dogs and donate money for them,” Liu said.

Liu and her two friends, who are also members of the band needed to find sponsorships, set up the venue and contact bands of high schools in Beijing to perform within two weeks. “Negotiating with sponsors was tricky sometimes as we needed to figure out what they wanted and trade with resources we had,”Liu recalled. They managed to cooperate with companies such as a study abroad agency to cover the expense as much as possible. Many parents also “sponsored” them with their homemade food.

The weather forecast had said that the day of the music festival, Aug 6, was going to be rainy. “We were so worried at first. But then a miracle happened: It only rained a little toward the end, helping us to sell the umbrellas we had prepared,” Liu said.

Audiences were mainly friends, parents and students. “Because of the pandemic, the audiences were limited to no more than 200 people, which also pushed us to come up with ways of earning money other than tickets,” Liu explained. Eventually, they managed to raise 50,000 yuan from rain gear, food, and accessories they had designed.

Having been looked down upon many times by professional bands in Beijing, Liu also sees this festival as a way of telling the world that high school bands are just as good. “I want to run our own music channel on Bilibili. Our love for music will never stop,” Liu said.