Today:
Fresh Air: Luke Harding, author of A Very Expensive Poison: The Assassination of Alexander Litvinenko and Putin's War with the West (Vintage, $16, 9781101973998).
Tomorrow:
HBO's Real Time with Bill Maher: John Avlon, author of Washington's Farewell: The Founding Father's Warning to Future Generations (Simon & Schuster, $27, 9781476746463).