Students watch a livestreamed popular-science lecture given by Chinese astronauts from China's space station Tiangong, at No. 70 middle school in Urumqi, northwest China's Xinjiang Uygur Autonomous Region, March 23, 2022. Chinese astronauts gave a livestreamed popular-science lecture, the second class from China's space station, to students on Earth Wednesday afternoon. (Xinhua/Ding Lei)
