Final answer:
Sigmund Freud revolutionized psychology with his theories on the human mind and the unconscious. Albert Einstein played a key role in the development of atomic weapons during World War II.
Step-by-step explanation:
Sigmund Freud and Albert Einstein had significant impacts on post-war society.
Sigmund Freud, known as the father of psychoanalysis, introduced new theories about the human mind and the unconscious. His work revolutionized psychology and influenced many areas of society, including art, literature, and therapy. Freud's ideas about the unconscious and the importance of dreams shaped modern understandings of human behavior.
Albert Einstein, on the other hand, played a crucial role in the development of atomic weapons during World War II. He was part of a group of alarmed scientists who urged President Franklin Roosevelt to invest in nuclear weapons development before the Germans could build their own. This letter, known as the Einstein-Szilard letter, ultimately led to the Manhattan Project, which resulted in the creation of the atomic bomb.