This hour, host Meghna Chakrabarti talks to U.S. Senator Ed Markey about his legislation to restrict the President's first use of nuclear weapons. We also talk to Adam Tanner, writer-in-residence at Harvard's Institute for Quantitative Social Science at Harvard University about his new book, Our Bodies, Our Data: How Companies Make Billions Selling Our Medical Records. Finally, we talk to famous, or infamous, advice columnist Dan Savage, co-founder of the "It Gets Better" project.