Why is matter solid? Why is there antimatter? Where do the sizes of atoms come from? Theoretical physicist and philosopher Sean Carroll cuts to the bare mathematical essence of our most profound theories, explaining every step in his new book, Quanta and Fields: The Biggest Ideas in the Universe. In this interview, Carroll uses the basics of quantum mechanics itself to explain measurement and entanglement before exploring how the world is really made of fields. Carroll's book, Quanta and Fields, is available for purchase now. Sean Carroll is Homewood Professor of Natural Philosophy at Johns Hopkins University, and Fractal Faculty at the Santa Fe Institute. He is host of the Mindscape podcast, and author of several bestselling books. He has been awarded prizes and fellowships by the National Science Foundation, NASA, the American Institute of Physics, the Royal Society of London, and many others.