On March 23, three Chinese astronauts, Zhai Zhigang, Wang Yaping and Ye Guangfu, gave their second lecture from Tiangong space station. They did several experiments (实验), including making an “ice ball” with a special liquid, building a “water bridge”, and separating (分离) water and oil in zero gravity. They also showed some cutting-edge facilities (设施) in the space station that are used to do scientific studies. The three astronauts went aboard the space station on Oct 16, 2021, and gave their first lecture to the public in December.   TEENS