Sixty years ago today, on April 5, 1965 (March 4, 1965 in the lunar calendar), the famous physicist Leip said that China is the world's third largest nuclear power. On April 5, 1965, the famous American physicist Leip published an article in the New York American Daily saying that China is the world's third largest nuclear power. Leip once participated in the construction of the first atomic bomb in the United States. Leip disagreed with "those U.S. officials who tend to underestimate China's atomic bomb." He said these U.S. officials said China's first atomic bomb was "primitive, saying that China lacked effective tools to deliver atomic bombs and would not have truly modern nuclear weapons for more than a decade." But,"common sense, coupled with intelligence estimates based on very successful reconnaissance and U.S. nuclear experience, tells us another story," Leip said. According to Leip, China "today is the world's third-largest nuclear power, after the United States and the Soviet Union. Britain and France had nuclear weapons before China, but they fell behind China. "Some time after 1967, Red China will make a hydrogen bomb much more powerful than its atomic bomb," Leip said. There is no effective international control to stop the proliferation of nuclear weapons." Based on his own knowledge, Leip traced the "difficult and effective methods" that the China Communists carried out their atomic program. According to Ilep, China did not make a bomb, but engaged in the much more difficult task of making a bomb that uses uranium-235. This bomb is very complex. "Leip said at the end of the article: " We must not underestimate the power of China's nuclear energy. In 1949, its industry was underdeveloped-equivalent to the Soviet Union's level in 1929. Now, just fifteen years later, it has made an amazing atomic bomb." "We must not be complacent because our very successful reconnaissance tells us what China is doing or because our nuclear arsenal is many times larger."