David Deutsch, a physicist and author renowned for his insights into quantum computation, takes listeners on a journey through the growth of knowledge. He argues that problems drive evolution, challenging the notion of survival of the fittest. Deutsch critiques bad philosophy in quantum theory and explores the deep connection between free will and knowledge creation. He introduces the idea that wealth is transformation, and champions the principle of optimism, discussing how constructor theory can pave the way toward making the world a better place.