Explore the captivating journey of nuclear energy in this concise booklet commissioned by the U.S. Energy Research and Development Administrations Office of Public Affairs. Crafted for readers with minimal technical background, it unveils the fascinating evolution of nuclear physics—tracing the monumental discoveries that paved the way from ancient alchemy to modern quantum mechanics. Delve into the interconnected realms of chemistry, physics, astronomy, and mathematics, and discover how these fields collectively contributed to our understanding and harnessing of nuclear energy. With insights reminiscent of the great Isaac Asimov, who authored over 500 works spanning various genres, this booklet is an enlightening read for anyone curious about the science that shapes our world today.