Heat 101; Reza Aslan; An Hour With Gail Collins

What you need to know to stay healthy and hydrated during the heat wave. Plus: Steven Dennis of Roll Call talks about what’s going on with food stamps, and the potential for limits on filibusters in Congress; Reza Aslan, associate professor of creative writing at the University of California, Riverside joins us to talk about his new book Zealot: The Life and Times of Jesus of Nazareth, and the next installment of this week's series on the Five Pillars of Islam; and New York Times columnist Gail Collins spends an hour on the show.