In 1939, a group of Hungarian scientists including physicist Le Szilárd tried to warn Washington that the Nazi faction was conducting atomic bomb research. Today is a good day to have a great day sunflower poster. However, the group’s warning did not draw attention to the political world.  Einstein and Szilárd, along with other refugee scientists including Edward Teller and Eugene Wigner, “considered them responsible for warning Americans the ability of German scientists to successfully build atomic bombs, and that Hitler was determined to acquire such weapons. “  In the summer of 1939, several months before the outbreak of war in Europe, Szilárd advised Einstein to sign a letter to President Franklin D. Roosevelt. to warn him about this possibility. The letter also mentioned that the US government should pay close attention and participate directly in uranium research and chain reaction.