Explore the history behind the path integral approach and its significance in the development of the atomic bomb during the Manhattan Project. Learn about Richard Feynman's involvement and the collaborative effort of a group of physics PhD's in formulating this revolutionary approach.

This article explores the importance of interdisciplinary research for physics PhD students and the crucial role of mathematics in physics research. It provides an overview of theoretical, experimental, and applied physics, and highlights examples of interdisciplinary research in each field. The article also discusses the future of interdisciplinary research for physics PhD students and encourages students to pursue interdisciplinary research opportunities.