72-year-old retired female professor of Tongji University has become popular on the Internet. Hardcore popular science physics is interesting

Wu Yuren, a 72-year-old retired professor from Tongji University, has been teaching physics popular science for 16 years and is known as "Grandma Wu" by netizens. After retiring from Tongji University, she has been committed to inspiring the public's interest in science in an interesting way.

Professor Wu Yuren started updating videos on Douyin in 2018, teaching people how to do physics experiments in the form of short videos. So far, the related content has been played more than 40 million times, and more than 800,000 netizens have fallen in love with the fun of doing experiments with Grandma Wu.

In the short video, Professor Wu Yuren has silver hair and two canine teeth when she smiles. In her hands, eggs, clothes hangers, coins...everyday items can be transformed into experimental equipment for experiments related to mechanics and electricity.

Some time ago, the Shenzhou 13 manned spacecraft was successfully launched. Many children began to wonder: How did the rocket fly into the sky? In order to answer this question, Professor Wu Yuren specially filmed a video.

By blowing balloons, everyone can understand that the speed of the rocket's flight comes from the reaction force of the rocket's combustion; then through the downward spray experiment of liquid nitrogen, the children can intuitively feel how much fuel is needed to break the first cosmic speed.

In addition to combining current hot topics, Professor Wu Yuren often uses science to subvert people's cognition of things that we are accustomed to in our lives. For example, how long is one second? Most people may not have seriously thought about this question, but for children, it is a great entry point for them to understand the concept of time.

On the TikTok account @不刷题, Professor Wu Yuren introduced that the latest international definition of "second" is: the time it takes for 9192631770 cycles of transition oscillation between two hyperfine energy levels of the ground state of the cesium Cs133 atom at sea level in zero magnetic field.

From this, she introduced the "Beijing Time" adopted by my country and left a question: Why is the time service center of "Beijing Time" built in Lintong, Shaanxi instead of Beijing? More than 4,000 netizens participated in the interaction in the comment area. Some people were doing their homework seriously, "Being close to the geographical center of China, the transmission error was minimized as much as possible when publishing the time", and some people were lamenting their lack of physics knowledge, "I understand every word after Cesium Cs133, but I can't understand it when they are combined together."

Professor Wu Yuren always patiently encourages and affirms everyone's different feedback. When netizens' analysis makes sense, she will say: "Three-dimensional analysis, comprehensive", and also add some other background knowledge; when netizens ridicule themselves for not understanding, she will say: "It's popular science, it's good to understand it."

Because of her humorous style of popular science and easy-to-understand experimental design, many people love to browse the Douyin account of "Science Grandma". Some fans said: "When I was a child, the school taught me this, I would have become a scientist." Some fans also started to bring their children to "class" and learn science with the professor.

Professor Wu Yuren said that the reason why he named his collection of popular science short videos "Science Grandma" is because many of his students now have children, and they always chase after him and call him grandma when they see him. "Later, gradually everyone started calling me that, filming videos for me, asking me to do popular science on TikTok, and calling me Science Grandma, which I felt a little ashamed of. In fact, it's like running into Granny Liu in the Grand View Garden. I am Granny Wu in the world of science, feeling fresh and curious everywhere.