Once, there were only four elements: fire, air, water and earth. When suggested otherwise, the new ideas were met with disbelief. Mario Livio, astrophysicist and author, joins host Krys Boyd to talk about Galileo Galilei, who revolutionized science and, because of it, endured condemnation and accusations of heresy. Livio’s new book is “Galileo: And the Science Deniers.”