【推荐1】Do you want to get some information about the latest inventions? Read the text and know how science and technology is helping to change the world positively.

In the airport, birds are the main threat. When airplanes try to take off, birds often hit the airplanes and die. These robot birds can rescue the real birds! The inventors will experiment with them at the Edmonton International Airport. So if the robot birds can work adequately in the long run, it will be great news for the birds and us too!

Here is a fantastic invention for basketball players who can’t spend much time training. This practice net has unique features. It can catch the basketball when a player shoots it into the net and send the ball back to the player automatically. The company is designing the practice nets which will come on the market soon.

Fish robots are invented by a team of Swiss scientists and look like minnows (米诺鱼). Scientists have used them to discover underwater lifestyles. When scientists put them under the sea, the result was terrific. All the real fish behaved naturally towards them. These fish robots could move like fish and change directions randomly. The scientists are now planning to add more real fish’s behavior to those fish robots.

Every year, many people die from shark attacks. The creators of lifesaver drones will make sure that the drone can spot any shark in the water. After detecting the shark, the drone will then search if there is any swimmer near the creature. If the shark tries to attack, it will rescue the swimmer and then take him to the dry land. These lifesaver drones will be deployed at the Oasis which is popular among surfers and swimmers in 2023.

【推荐3】Next time you watch videos in high resolution, pause for thought. Your decision may be having an unnecessary impact on the environment.

Watching videos on a smartphone in high resolution produces eight times as much carbon as viewing in standard definition, according to a report from the Royal Society. It adds that the difference in resolution is unlikely to be noticed on small screens anyway and suggests that the users should make a sensible choice in some circumstances.

“Avoiding streaming in unnecessarily high resolution will help reduce emissions,” the report says. “Platforms and regulators should consider limiting streaming resolution.” It recommends that, as part of a move “responsible streaming”, video should be turned off for many YouTube users who are only listening to the content. A previous study found that such a move could save between 1 per cent and 5 per cent of YouTube’s total emissions.

The authors do not calculate how much a person’s carbon footprint would be reduced by watching videos in lower resolution. However, they admitted that digital technology also plays a significant role in reducing emissions, such as by enabling people to communicate virtually rather than travel to meet face to face. “Digital technology lets us do things differently and it has huge potential to help reducing emissions—if used responsibly,” said Adrian Friday, professor from the University of Lancaster, who is a member of the working group for the report.

Using laptops, tablets, smart TVs and other devices for longer before upgrading will also reduce emissions, the report says. “Protecting and repairing phones is good practice to help keep them longer. Getting a phone or other device second-hand, or passing it on, and sharing equipment are other good ways.”

【推荐1】If you want to stay in shape, but don’t have the time to go to the gym, the Mobile Gym is a good solution. It’s basically a large bus filled with the latest fitness equipment. You can find everything you need for a complete workout, and here’s the best part—you don’t need to go to the gym, and the gym comes to you!

The Mobile Gym was the idea of Adam Zickerman, founder of Inform Fitness, a popular chain of gyms across the United States. It hit him when he ordered lunch from a food truck one afternoon. So why not put a gym on a truck?

Zickerman experimented with a few designs and then invested $ 60,000 on making adaptations and fixing machines. He didn’t really need an advertising budget as the bus advertised itself. Carole Pallmeyer, for instance, found herself driving behind the Mobile Gym one day. At first she thought it was a regular bus with ads for a gym. But then she realized the bus itself was a gym, so she booked workout sessions for her entire family. “We are all busy, but we know the bus is coming and make sure we are home at 4:30 for the workouts,” she said. “You forget you’re on a bus because the workouts are tightly scheduled.”

Unfortunately, it is illegal to use the fitness equipment while the bus is moving, so you don’t get to save time by working out during the rush time. It operates only once a week, only two clients (客户) can be accommodated at a time on the bus. And it doesn’t come cheap. Sessions start at $100, while in-house workouts are $65. But the Mobile Gym appears to be a big hit.

“There are so many benefits to having the Mobile Gym come to you,” Zickerman said. “Only five to seven exercises complete a total- body workout when performed using our special equipment.” He also added that a 20-minute workout might sound easy, but it is really difficult and provides instant results. “It is very challenging and clients understand quickly why rest is important between workouts.”

【推荐1】A baby seal robot from Japan has came to the U.S. It's been sold in Japan for several years, but now the company has created a Florida-based unit, Paro Robots U.S. Inc., to sell the creature to places like nursing homes and hospitals. The robot, named Paro, is marketed as a therapeutic（治疗的）device that can help comfort people who have problems that can lead to social isolation（隔离）.

Takanori Shibata, a Japanese engineer, invented Paro. He says the robot, which weighs about 6 pounds, is able to respond to touch, light, and sound.

Shibata says he tried making robotic cats and dogs, but that people didn't find those convincing. "They expected too much,"' he says, and would compare the robot to real animals they had known. Few people have ever seen a live baby seal, so they aren't likely to draw comparisons between the robot and the real thing. So they accept Paro as a cute little companion.

The Vinson Hall Retirement Community in McLean held a recent event to showcase the robot and Virginia Long slowly came into the activity room. When a nurse put the robot on her lap, it began to shake slightly, and Long talked to it gently. “Why are you shaking? Are you cold?" she asked. The robot made a high sound, and Long laughed. She said she used to have a cat, “but somebody stole him." "Petting a seal is unusual," she said, "but a lot of people have strange animals.

But some experts say a robot is no replacement for a real animal. "One of the things that we've learned is that it is the unexpected and natural behavior of the living creature that adds so much value to people's experience. Any kind of newness can get the attention of people who are lonely and bored, but that doesn't necessarily help them live a meaningful life. It doesn't solve the problem that is really causing their lack of enjoyment of life," says Bill Thomas, a professor at the University of Maryland, Baltimore County.

A lodestone compass was used in China during the Han Dynasty between the 2nd century BC and 1st century AD, where it was called the “south-governor” (sīnán). It was not used for navigation, but rather for geomancy and fortune-telling. The earliest reference to a magnetic device used for navigation is in a Song Dynasty book dating to 1040-1044, where there is a description of an iron “south-pointing fish” floating in a bowl of water, aligning itself to the south. The device is recommended as a means of orientation “in the obscurity of the night.” The first suspended magnetic needle compass was written by Shen Kuo in his book of 1088.

For most of Chinese history, the compass that remained in use was in the form of a magnetic needle floating in a bowl of water. According to Needham, the Chinese in the Song Dynasty and continuing Yuan Dynasty did make use of a dry compass, although this type never became as widely used in China as the wet compass.

The dry compass used in China was a dry suspension compass, a wooden frame crafted in the shape of a turtle hung upside down by a board, with the lodestone sealed in by wax, and if rotated, the needle at the tail would always point in the northern cardinal direction. Although the 14th century European compass-card in box frame and dry pivot needle was adopted in China after its use was taken by Japanese pirates in the 16th century (who had in turn learned of it from Europeans), the Chinese design of the suspended dry compass persisted in use well into the 18th century.

【推荐3】Microwave ovens provide an easy way to quickly heat food when hunger strikes. But does the convenience of microwave cooking come at the cost of losing nutrients of foods?

The answer may surprise you.

Any kind of cooking method will result in some nutrient losses, so our concern is to what degree nutrients are damaged, explained Scott A. Rankin, professor and chair of the Department of Food Science at the University of Wisconsin-madison. “Typical microwave heating results in minimum losses of valuable nutrient losses in foods,” Rankin said.

The factors (因素) that affect nutrient losses in foods during cooking include time (the longer the food is cooked, the more nutrient loss); temperature (the more heat, the more losses); and the amount of liquid the food is cooked in (the more water, the more nutrient loss).

Microwave cooking sends out wavelengths that are absorbed by water molecules (分子) in food, which produce heat as they renosate (共振) with those wavelengths in food, Rankin explained. So heating food in a microwave often requires very little or no liquid at all.

Additionally, a conventional oven heats food from the outside in, so the surface of food can be exposed to extra heat by the time it reaches its target temperature, increasing the potential for nutrient loss. With microwave cooking, the temperature heats the food the same everywhere, so the point at which the food has reached the desired temperature is achieved with little nutrient damage, Rankin said.

Steaming in the microwave is preferable to sinking foods in water, which can result in a loss of nutrients. “You can use a microwave steaming plate with water in the bottom, or simply add your vegetables and a small amount of water to a microware-safe bowl and cover with microwave-safe plastic wrap, leaving one comer open to allow air to escape,” said Whitney Linsenmeyer, a registered dietitian and spokeswoman for the Academy of Nutrition and Dietetics.

Whether you choose microwaving or conventional cooking methods, keep your cooking temperature low when possible. It's also best to use methods that require least added liquid, Linsenmeyer said.

【推荐1】College students may find a greener campus when they return to classes this fall. Some schools are repairing older buildings and constructing new ones that are better for the environment. Other steps include adding wind and solar energy systems and planting vegetable gardens.

George Washington University（GW）is a private school with 200.000 students. The university has two gardens where students volunteer their time.

Over the last ten years GW has developed projects in three main areas-climate, water and eco-systems. They have begun to create projects on the ground to address climate change, They are planning on becoming carbon-neutral（平衡的）and, in fact, reducingthe footprintby forty percent by 2025, from creating solar hot-water systems on our rooftops to making our buildings much more energy efficient. The school also offers 140 different classes in sustainability（可持续性发展）and the environment.

Mark Orlouski said. "We see numbers like less than 20% of school having a green building policy five years ago, and now upwards of 80% of schools having a policy, which states that their new buildings will be built in a green fashion.

GW is located in the Foggy Bottom neighborhood of Washington. Some neighbors say that while GW is laying to be Friendlier to the environment, it could also be a better friend to the neighborhood The school has expanded quickly and there have been tensions between students and local residents

【推荐2】Welcome to the Virtual Broadcom MASTERS!

You're invited to attend a virtual(虚拟的) public exhibition of the Broadcom MASTERS finalists' original research projects. These 30 finalists were selected from a pool of 3 476 participants nationwide. Between March 16 and 21, they'll gather online to compete for more than $ 100,000 in awards and to be recognized as the nation's most promising young scientists and engineers.

Major Activities for the Finalists

●Participate in a private judging process with a group of top scientists.

●Engage in team challenges where they will be judged on their mastery of critical thinking, communication and creativity in each area.

●Respond to questions from 2 to 4 p. m. on March 20.

Time for Virtual Exhibition

●It'll open on March 20 at 10 a. m. and will be available to the public through April 4.

More about Virtual Exhibition

●The Broadcom MASTERS is taking place virtually for the first time to keep finalists and their families safe at this time.

●The society will be providing educational materials for educators who are interested in bringing students to the exhibition for a digital field trip.

●Visitors to the exhibition will also have an opportunity to visit the STEM Experiential Hall where you can get access to immersive STEM experiences.

●Please plan on watching the Winners Award Ceremony on March 21 at 7 p. m. and see who brings home the prize of $ 25 000.

【推荐3】As an educator and health care provider, I have worked with numerous children infected with the virus that causes AlDS. The relationships that I have had with these special kids have been gifts in my life. They have taught me so many things, but I have especially learned that great courage can be found in the smallest of packages. Let me tell you about Tyler.

Tyler was born infected with HIV: his mother was also infected. From the very beginning of his life, he was dependent on medications to enable him to survive. When be was five, he had a tube inserted (插入) in a vein in his chest. This tube was connected to a pump, which he carried in a small backpack on his back. Medications were linked to this pump and continuously supplied through this tube to his bloodstream. At times, he also needed supplemented(补充的) oxygen to support his breathing.

Tyler wasn’t willing to give up one single moment of his childhood to this deadly disease. It was not unusual to find him playing and racing around his backyard, wearing his medicine-laden backpack and dragging his tank of oxygen behind him in his little wagon. All of us who knew Tyler were amazed at his pure joy in being alive and the energy it gave him. Tyler’s mom often teased him by telling him that he moved so fast that she needed to dress him in red. That way, when she peered through the window to check on him playing in the yard, she could quickly spot him.

This dreaded disease eventually wore down even the likes of a little dynamo like Tyler. He grew quite ill and, unfortunately, so did his HIV-infected mother. When it became apparent that he wasn't going to survive, Tyler’s mom talked to him about death. She comforted him by telling Tyler that she was dying too, and that she would be with him soon in heaven.

A few days before his death, Tyler called me over to his hospital bed and whispered,“might die soon. I’m not scared. When I die, please dress me in red. Mom promised she’s coming to heaven, too. I’ll be playing when she gets there, and I want to make sure she can find me.”