Consider this crazy number: 150 million people around the globe are migrants, moving here and there, either looking for work or avoiding political violence or both. With the echoes of the attack on undocumented workers in the U.S. firmly in mind, I explored this astounding fact with an expert in Africa and an advocate in the U.S.

Wrapping it all up is our Robber Barons segment. This week’s winner? Chevron, tax avoider and poisoner of the Amazon.