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This year marks the 20th anniversary of China's first manned space mission, with Yang Liwei becoming the first Chinese astronaut to go to space. Since then, another 19 astronauts have reached for the stars. The selection of the fourth generation of astronauts began in 2022 and is now in full swing. Experts revealed how tough the training is before astronauts can fly to space.

The human body is not designed for space life. Astronauts are faced with multiple challenges on a space mission. The changes in gravity can have an impact on their bodies. The sensation of confinement (封闭) living in a small spacecraft for months can damage their mental health. Emergencies during missions challenge their knowledge and ability to solve problems under huge pressure. So it's no wonder that astronauts have to meet extremely high standards and go through a tough training program.

To make sure that Chinese astronauts complete their missions and return to Earth safely, "Eight types, including over 200 subjects of training, were set," Huang Weifen, chief designer of the astronaut system for China's manned space project, told CCTV News. Apart from physical fitness training, it also includes basic scientific theories, psychological health, and mock (模拟) missions.

Among the training subjects, the most tiring one is underwater training. This training is designed for astronauts to adapt to the microgravity environment in space. According to Huang, astronauts stay underwater in suits weighing over 100 kilograms for six hours at a time. Water resistance (阻力) and the heavy suit make every move exhausting. "Nie Haisheng, one of the astronauts, once reported a two-kilogram loss in weight after one underwater training exercise," said Huang. Each astronaut receives training for at least three and a half years before having the chance to go to space.

Michael and his wife, new residents in a San Francisco apartment, learned about their neighbor Jeff Dunan's volunteer work for Bangladesh Relief, an organization that provides food, clothing and essential supplies for disadvantaged people in northern Bangladesh. Inspired, Michael donated $150 to Dunan's GoFundMe campaign. However, a credit card notification alerted him to an unintended $15,041 charge.

When he saw the five-figure number, he was confused. Soon, it all made sense. Michael's credit card number started with four and one. Clearly, he accidentally began typing his credit card information while his cursor (光标) was still in the donation box.

Michael planned to call Dunan to explain, but before he had the chance to do that, he started receiving Facebook messages from Shohag Chandra, the charity's Bangladesh-based program manager, thanking him for his generous donation. After he looked through the photos of people holding thank-you signs that read his name, Michael's heart sank. He felt terrible that he had to withdraw his handsome donation. Once his original contribution was refunded, he decided to donate $1,500.

Although Michael had told his family and friends about the tale, he decided to share it publicly on social media, after Dunan told him the organization was desperately in need of funds. "The least I could do was take the time to post this story online and see if I could inspire other people to donate to the cause," Michael said.

Little did he know, though, that the story would be seen far and wide, ending up raising more than $120,000 for Bangladesh Relief in the span of only a few weeks—about eight times Michael's mistaken donation. According to Dunan, more than 3,700 people have contributed because of Michael's post. Michael has been stunned (震惊) by the ongoing outpouring of support. "Never in my wildest dreams did I imagine this reaction," he said. "People can be amazing when they come together for something like this."

Animals were the real pioneers of space flight. Let us learn about some animals that have been to space.

A. Fruit flies

On February 20, 1947, the United States sent some fruit flies into space to study the impact that cosmic radiation (宇宙辐射) might potentially have on astronauts in the future. They chose flies because they are genetically similar to humans.

When they returned to Earth, the scientists found the flies alive, with no evidence of the effects of radiation.

B. Mice

Mice have long been used to find out more about how space travel will affect the human body. In fact, NASA has recently published a study of mice housed at the International Space Station. It shows that mice quickly adapt to microgravity (微重力) conditions.

The very first mouse went into space in 1950, reaching an altitude of 137km. However, unlike the fruit flies, the mouse died when the rocket broke into parts due to a parachute (降落伞) failure.

C Dogs

Laika, a Russian homeless dog, went to space on November 3, 1957. She was picked up on the streets and was thought suitable because she had a gentle temperament (性情) and behaved well. The scientists also believed a homeless dog would be better at dealing with difficult conditions like microgravity than a pet dog.

Laika is famous for being the first animal to orbit (环绕……运行) the Earth. However, she never returned.

D. Spiders

In 1973 two garden spiders called Anita and Arabella were used in an experiment to see if they could still build webs in space.

Both spiders managed to build webs, even though the webs were slightly finer than on Earth. The study showed a great deal about the effects of microgravity on motor response (运动反应).