Nuclear Fission: This is the process by which the nucleus of an atom splits into two smaller nuclei, releasing a large amount of energy. It's what powers an atomic bomb.
Manhattan Project: This was a research project during World War II that led to the creation of the first atomic bombs.
Hiroshima and Nagasaki: These are two Japanese cities that were destroyed by atomic bombs dropped by the United States in August 1945, leading to Japan's surrender and ending World War II.