In 1939, who wrote a letter to president roosevelt alerting him to "a new and important source of energy" developed by scientist in the united states?

It was Albert Einstein, who in 1939 wrote a letter to President Roosevelt alerting him to "a new and important source of energy" developed by scientists in the United States, since he was referring to the potential to build an atomic bomb. 

Corn and beef broth the american and mexicans ate

Federal deposit insurance corporation