Photo taken on April 13, 2021 shows the experimental advanced superconducting tokamak (EAST). Chinese scientists have set a new world record of achieving a plasma temperature of 120 million degrees Celsius for a period of 101 seconds in the latest experiment on Friday, a key step toward the test running of a fusion reactor. The experiment at the experimental advanced superconducting tokamak (EAST), or the "Chinese artificial sun," also realized a plasma temperature of 160 million degrees Celsius, lasting for 20 seconds. (Xinhua/Zhou Mu)