Astronauts of the Shenzhou XIII manned spacecraft Zhai Zhi Gang, Wang Ya Ping, and Ye Guang Fu broadcasted a live lecture from space this afternoon to secondary and primary school students around the country.  Pui Ching students Zhang Jing Ping, Un Chong Un, and Hong Ut Chio attended the live video conference at the Macao Science Center.  Senior 1 and Senior 3 students and students of the Astronomy and Meteorology Club watched the live broadcast at school.  The live lecture spread much knowledge about manned spacecrafts and was well received among students.  The conference session had great educational value and piqued student interest in aerospace technology.