Everything we know depends on the knowledge of people who came before us. In this lecture, Neil Turok explores our understanding of the universal laws of nature, from Pythagoras and the Greek mathematicians to the present day. Many of the fundamental things we once believed to be true – how electricity and magnetism behave, for example – have been turned on their heads as we thought and observed and experimented. The laws of nature have evolved from a basic understanding of the world around us to complicated explanations of our interconnected world. Today, we are on the cusp of a new revolution: Quantum physics has revealed that the behavior of our universe is stranger than anyone – especially our ancestors – could have imagined. This lecture was taped live in St. John's, N.L.