1 . China has just officially opened its FAST radio telescope to international scientists. Scientists across the world can submit proposals for astronomical observations using the telescope.

FAST is short for Five-hundred-meter Aperture Spherical Telescope (球面射电望远镜) and it is also believed to be the world's largest radio telescope and the most sensitive single-dish radio telescope. The receiving surface area of FAST is 250,000 square meters, about the size of 30 standard football fields. Its construction was completed in September 2016 and it officially began operating in January 2020.

The major scientific task of the telescope is the observation of pulsars (脉冲星) – the rotating neutron stars. The study of pulsars can help to confirm the existence of gravitational radiation and black holes, and help solve many other major questions in physics. Another scientific goal of FAST is to search for outer space civilization.

The telescope is located in a naturally deep and round karst depression in southwest China's Guizhou Province. The first advantage of the selected site is the altitude. The average altitude of Guizhou is about 1,100 meters, which maximizes the effectiveness of the observation equipment. Secondly, the radio telescope needs to have a “big pan” to receive better signal. The huge natural depression could reduce the amount of excavation (挖掘) and difficulty of construction. Moreover, the selected site in Guizhou is far away from cities, and has a small population, which reduces the interference (干扰) caused by wireless devices such as TVs, mobile phones and radios from human activities.

FAST has identified over 300 pulsars. Experts predict that the number could reach 1,000 in five years and that the telescope could locate and identify the first pulsar outside the galaxy. With the opening-up to international scientists, China's FAST is expected to make more contribution to astronomical research in the future.

3 . When it comes to sitting properly, we all know the correct way even if we don' t do it to the letter. No crossed legs, bottoms touching the back of the chair and feet on the ground. But even if you' re doing it right, sitting for long periods is shockingly bad for you. It has been described as the new smoking, linked to heart disease and even cancer. There is no doubt we should all try to do less of it. But perhaps we could also do it better.

A classic survey, published in 1953, described 100 different sitting postures adopted by 480 cultures around the world. Among the most common were sitting cross-legged, kneeling and the deep squat (深蹲), with feet flat on the ground and bottoms resting on or just above it. Even in Western cultures, these are preferred sitting positions among young children. But Westerners tend to prefer chair use from an early age, insisting children sit on seats in school.

One big problem with this desire for chairs is that they make sitting so, well, sedentary (久坐不动的). Consider the Hadza, a group of hunter-gatherer people in Tanzania. They spend around 9 hours a day sitting. However, they squat and sit on the ground in various positions, and this involves high levels of muscle activity. The supportive nature of chairs, with their high backs and armrests, removes this effort perhaps the reason that people love them.

So what' s the best way to sit? Josette Bettany-SaItikov at Teesside University, UK has found that kneeling can help keep the spine in a better position as does squatting. We might also take inspiration from traditional cultures like the Hadza. "Use a variety of postures and preferably not just still postures but some which allow movement," says Bettany-Saltikov.

Bettany-Saltikov believes that we should be rethinking what it means to do a desk job. "We still need to design workplaces that enable people to be productive while being lightly active, like with under-table cycling or walking desks," she says. For now, if your job is sedentary, don' t forget to stand up regularly and move around.

4 . Online Bachelor's Degrees and Programs

The overview

Colleges offer online degrees in a range of fields. Click on a degree program to explore what courses you take, how long the program takes to complete, career options and average salary. For example, to earn an online health science bachelor's degree, you would take courses in public health, health communications and epidemiology(流行病学).

The benefits

Pursuing an accredited(官方认可的)online bachelor's degree can help you take the next step in your career. Through your program, you'll attend online lectures, study from home manage a busy schedule and interact virtually with professors and classmates.

The applicants

An online college degree may appeal to those who want more flexibility in completing their education, or who want to take classes while working full time or parenting. Choosing where to register online will likely be challenging, but below you'll find tools, advice and other resources to make your search easier.

Best online bachelor's programs

U. S. News evaluated several factors to rank the best online bachelor's degree programs, including graduation rates and support services available remotely.

To see the full ranking list, please click here.

5 . In late May, storms flooded streets in Florida. The floods made cars sink and turned roads into brown rivers. Flash flooding can happen when storm drains get blocked up and, especially during hurricanes, overflow into streets. It’s the leading cause of weather-related deaths.

A team of local middle-school students has a plan to stop this ongoing problem. Alyssa, Bianca and Jose are sixth-graders. The Doral students designed a device to warn city workers when and where there is a danger of flooding. The team is one of five grand-prize winners of the Samsung Solve for Tomorrow Contest. The contest asked for science, technology, engineering and math (STEM) solutions to the biggest challenge facing a school community.

“I’ve been living here my entire life, and all of us have encountered problems with flooding,” says Bianca. “We knew that was the problem we were going to tackle.”

The students’ device uses a laser system called lidar, which stands for “light detection and ranging.” The device, if approved by the city government, could be attached to Doral’s 2,575 storm and manhole drains — one device per drain. If a drain gets blocked with sediment (沉积物), the device could send a warning message to the city’s stormwater management office. Then the stormwater manager could send someone to clean the drain.

Starting in March, the school was closed, so team meetings went virtual. Luckily, says Bianca, “We already had a prototype device, and we just had to adjust it some more ” They also had to pitch their idea virtually to contest judges.

Twenty finalist teams were cut down to the five grand-prize-winning teams. Each of the five teams won $100 000 for technology and supplies for their science classrooms. “We put m a lot of effort and had to trust each other and that each one knew what they were talking about,” says Alyssa.

6 . Motion sickness is an uncomfortable feeling. The sickness it causes can strike people on an airplane, playing video games, or, commonly, when riding in a car. In a future where people may find themselves running around streets in self-driving vehicles, the problems could get worse.

We typically sense our physical position and movement in the world by relying on our eyes, the feeling we get in our body, and our inner ear. Motion sickness may develop when there's disagreement between what your eyes see and what your inner ear senses. If you're looking at your phone in a moving vehicle, your eyes see a stationary screen but your inner ear feels that you're moving. The result of that dissonance can cause sickness. The common-sense solution is to just stop looking at your phone, but some of the appeal of self-driving cars is that you could use the time to be productive or entertained by what's on a screen.

Researchers of a car-making company and a video game company have been studying ways to address these issues. And their solution uses an interesting medium: sound. The research had two goals: to explore if sound could help relieve motion sickness, and to help people trust self-driving cars more. They experimented with two different categories of sound: tips that tell passengers what's about to happen, and noises that alert passengers when the device has noticed something, like a pedestrian.

The most convincing experiment took place on a closed airport runway in Sweden, near Gothenburg, in August of last year. On that track, brave participants had to ride in the backseat of a car driven by a human and read from a tablet while the car navigated the course. With just 20 people, the study was small, but according to researchers, the presence of sound tips made people report that they felt less ill. Participants said the sounds helped prepare them physically, or adjust their bodies for what was about to happen.

9 . In the long history of humans, women’s stories have often been overlooked. Yet as modern society has allowed women to speak for themselves, more and more women are standing up to choose how to live their lives. Here are five powerful films that just might inspire you to re-imagine what it means to be a woman.

Hi, Mom (2021)

Directed by Chinese comedian Jia Ling, this heartwarming comedy, about a woman who accidentally meets her mother during time travel, became a hit with audiences this year, leading the mainland box office right after Chinese New Year.

Leap (2020)

This 2020 film about the Chinese national women’s volleyball team presents their history from 1981, when they won the Women’s World Cup, to the year 2016. Actress Gong Li stars as the legendary volleyball player Lang Ping, and Peter Chen from Hong Kong is the director.

Coco Avant Chanel (2009)

The life of Coco Chanel serves as a guide to all women wishing to establish their own careers. Audrey Tautou, famous for her iconic performance in Amelie, stars as the glorious French fashion designer. It is French director Anne Fontaine’s most famous film.

The Joy Luck Club (1993)

Based on the novel The Joy Luck Club, Chinese director Wang Ying tells the stories of four Chinese women and their daughters who were all born and lived in the US. Their conflicts also reflect the collision between traditional Chinese culture and American culture.

The Story of Qiu Ju (1992)

Directed by Zhang Yimou, the 1992 film describes a peasant woman Qiu Ju who lives in a rural area of China and fights for justice. It is a screen adaptation of writer Chen Yuanbin’s novel The Wan Family’s Lawsuit.