Einstein’s theory of relativity, quantum physics, and finding evidence of black holes — trace the chain of discoveries that led to these breakthroughs and you'll end up with the Italian astronomer and inventor, Galileo Galilei. Renowned Italian theoretical physicist and author Carlo Rovelli says we can learn a lot from Galileo today. He explains how 400 years ago, this renaissance man of science was discovering new facts about the Universe to understand ourselves better — and so are we.