1939年9月1日,二战爆发。不少科学家此前已知德国在研制原子弹。他们忧心忡忡,为此找到名气比他们大的爱因斯坦,希望他牵头签署致罗斯福总统的信,建议抢在德国之前造出原子弹。爱因斯坦毫不犹豫署了名,还另外亲笔给总统写了一封长信。罗斯福总统很快就采纳了建议,下令成立了一个“铀顾问委员会”。几乎与此同时,日本也启动了核武研究计划。美国得分秒必争。紧张地做了大量的准备工作后,于日本偷袭珍珠港 September 1, 1939, World War II broke out. Many scientists have previously known that Germany is developing atomic bombs. They were worried, finding Einstein with a bigger reputation than them, hoping he would take the lead by signing a letter addressed to President Roosevelt, proposing that a nuclear bomb should be made before Germany. Einstein did not hesitate to sign his name, but also personally wrote a long letter to the president. President Roosevelt quickly adopted the proposal and ordered the establishment of a “Uranium Advisory Council.” At almost the same time, Japan also launched a nuclear weapons research program. America scored seconds to fight. Tensibly done a lot of preparations, the attack on Pearl Harbor in Japan