We dive into theoretical physics, the branch of science that uses mathematics and abstract reasoning to explain the universe’s fundamental laws. The episode introduces three key concepts: relativity, which redefines space, time, and gravity; quantum mechanics, which describes the strange behavior of matter and energy at the smallest scales; and string theory, a bold framework proposing that the universe’s basic building blocks are tiny vibrating strings existing in multiple dimensions. We also explore how theoretical physics aims to unite these ideas into a single “theory of everything” and why this pursuit is essential for understanding both the cosmos and our place within it.