From Planck's quanta of light to Planck's star in quantum gravity and quanta of time, this course offers an introduction to the quantum universe. It covers the development of the notion of quanta, from its origin as a solution to the ultraviolet catastrophe in the emission of radiation, to its ultimate consequence - the potential quantization of space and time.
Using a minimum amount of mathematical terminology, the course explores the revolutionary theory of quanta, its many successes, its various interpretations, some of its applications, and its problematic relation with the theory of relativity.