Retired physics professor Wu Yuren has become an online sensation on Chinese social media with her quirky science videos. Affectionately called “science grandma” online, the 72-year-old’s short-form videos about physics have attracted more than one million followers and over 50 million views. The professor began making short-form videos on China’s video-sharing platform Douyin three years ago, hoping to bring physics to the masses in a casual, inspiring and fun manner.