Rubber is all around us: from sneakers to tires to basketballs. On today’s Please Explain, we'll find out where rubber comes from, how it’s created and used, and how it changed the world. We're joined by John Loadman, analytical chemist and author of  Tears of the Tree: The Story of Rubber--A Modern Marvel, and Joe Jackson, author of The Thief at the End of the World: Rubber, Power, and the Seeds of Empire.