Harvard's professor of psychology, Steven Pinker is Bill's interview subject this week. For the panel, he is joined by activist and musician Killer Mike alongside national political reporter for The Washington Post, Robert Costa.

Interviewee: Glenn Greenwald Panelists: Steve Schmidt, Jennifer Granholm, James Carville Panel Guest: (a very stoned) Mary Matalin Topics: Obama's speech on NSA reform, Chris Christie's Fort Lee lane closure scandal, Benghazi, Independents' self-identification rising, 2014 Elk River chemical spill, marriage between a Democrat and a Republican, global warming affecting animals, Republicans' war against the poor, unemployment benefits, minimum wage, women in US politics.

Interviewee: John Ridley ("12 Years a Slave" screenwriter) Panelists: Chrystia Freeland (Canadian Member of Parliament), Ronan Farrow (MSNBC host), Darrell Issa (R-CA) Panel Guest: Stephen Merchant (writer/actor "Hello Ladies") Topics: Solomon Northup and slavery, 2014 State of the Union Address, minimum wage in the United States, income inequality, demographics of the top 1%, Gerrymandering, differences between UK and US politics, stand-your-ground laws and African Americans, gun politics, Michael Grimm threatening a reporter, Flip a District, puritanism.

Interviewee: Charlie Crist Panelists: Tom Colicchio, Alicia Menendez, S. E. Cupp Panel Guest: P. J. O'Rourke Topics: Independents in US politics, Cuban embargo, immigration reform, executive orders, Congressional Budget Office's report on Obamacare's effect on jobs, lowest abortion rates in 30 years, Russia and communism, heroin and prescription drugs, United States Department of State's report on the Keystone Pipeline, federal spending for children vs. for senior citizens.

Interviewee: Jeremy Scahill ("Dirty Wars" Docu-maker) Panelists: Andrew Sullivan ("Daily Dish" blogger), Mayim Bialik ("Big Bang Theory" star and vegan author), Eric Klinenberg ("Going Solo" author) Panel Guest: Bill Nye Topics: Creationism vs. science, Comcast–Time Warner Cable merger, net neutrality, drop in infrastructure spending, targeted killings of US citizens who plot against other Americans, veganism, attachment parenting, World Health Organization's warning about cancer, Philip Seymour Hoffman's published diaries, Edward Snowden praising Russia.

Interviewee: Christopher Leonard (author "The Meat Racket") Panelists: Austan Goolsbee, Margaret Hoover, William Kristol Panel Guest: Bruce Dern Topics: The Meat industry's secretiveness, Obama's failed efforts to reform corporate agribusiness, azodicarbonamide in Subway bread, Tea Party movement and bailouts, military budget of the United States, intervention vs. diplomacy, poverty in the Midwest, WhatsApp acquired by Facebook, homophobia in the bible, victim playing by the 1 percent.

Interviewee: Errol Morris (author of "The Unknown Known") Panelists: Keith Ellison, Sheila Bair, Simon Schama Panel Guest: Shane Smith (host of Vice) Topics: The Unknown Known, Donald Rumsfeld & the Iraq War, 2014 midterm elections, Democrats & gun politics, Flip a District candidates: Michael Grimm & Blake Farenthold, Greenland & climate change in the Arctic, CNN & quality of journalism in the 24-hour news cycle, 2014 Russian military intervention in Ukraine, relationship between Pakistan & bin Laden.

Comedian and Actor Kevin Nealon, Ex-Governor Brian Schweitzer (D-MN), from "Fed Up" Dr. Robert Lustig, GOP Pollster Kellyanne Conway and Author of "Every Nation for Itself" Ian Bremmer.

John Waters, Anthony Weiner, Ralph E. Reed, Jr., Nicolle Wallace and Jim Geraghty

Political activist Ralph Nader; author Douglas Brinkley; deputy chief of staff to the House Majority Leader, Doug Heye; Rep. Barbara Lee (D-Calif.).

Former Secretary of State Gen. Colin Powell; political activist Matthew Segal; Rep. Jack Kingston (R-Ga.); editor Katrina vanden Heuvel; actor Wendell Pierce.

This weeks guests include Oscar winner Ben Affleck, Senator Elizabeth Warren (D-MA), New York Times Op-Editor Nicholas Kristoff, Ex-RNC Chair Michael Steele, and "Waking Up" author Sam Harris.

"Black Prophetic Fire" Author Cornel West, Conservative Commentator Mary Matalin, "Daily Beast" Editor-In-Chief John Avlon.

Actress and "Food Chain" EP Eva Longoria, Author and General (Ret.) Wesley Clark, Senator Angus King (I-ME), and Journalist Rula Jebreal.

Season Finale. "The Interview" star Seth Rogen, MSNBC "Hardball" host Chris Matthews, Monty Python Alum & "So Anyway..." author John Cleese, Canadian MP Chrystia Freeland and "News One Now" host Roland Martin.

Bill interviews comedian Jimmy Kimmel ahead of a panel discussion with TIME's Senior Correspondent Charlotte Alter and political pundit Matt Welch.

This week, Bill interviews author Ben Sheehan and for the panel discussion is joined by historian Nancy MacLean and author Thomas Frank.

This week, Bill interviews Democratic Congressman representing New York's 15th district, Rep. Ritchie Torres. Joining him for the panel discussion are Governor John Kasich and journalist Chris Matthews.

Bill interviews fellow comedian Nikki Glaser to open the show and is then joined on the panel by political commentator Paul Begala and journalist Jane Coaston.

This week, Bill opens the show by interviewing acclaimed film director Quentin Tarantino, and for the panel is joined by author Max Brooks and pop-historian Dan Carlin.

Bill opens this week's episode by interviewing Washington Post journalist Craig Whitlock. For the panel, he's joined by British journalist Katty Kay and conservative Christian lobbyist Ralph Reed.

Tristan Harris, co-founder of The Center for Humane Technology, is Bill's interviewee at the top of the show and joining him on the panel are MSNBC contributor Jennifer Rubin and national spokesperson for No Dem Left Behind, Richard Ojeda.

This week, Bill sits down with New York Times bestselling-author Annabelle Gurwitch. For the panel, he is joined by Scott Galloway, Professor of Marketing at NYU Stern, and comedian Larry Wilmore.

Interviewee: Erin Brockovich Panelists: Josh Barro, Howard Dean, Carly Fiorina Panel Guest: Willie Nelson Topics: 2014 Elk River chemical spill and coal mining, Republicans and women issues, Obamacare, Richard Sherman's outburst after game against the San Francisco 49ers, Obama's inconsistent policies about marijuana, poverty and income inequality, 2014 Winter Olympics and Vladimir Putin's comments on LGBT people.

Interviewee: Michelle Alexander Panelists: Charles Cooke, Jane Harman, Rachel Maddow Panel Guest: Steve Coogan Topics: The New Jim Crow, incarceration in the US, human rights in North Korea, MSNBC's overcoverage of the Chris Christie scandal, BYU's anti-masturbation campaign, Philomena, forced adoptions in the Catholic Church, Pat McCrory blocking lawsuits against Duke Energy, drought in California and regulations, John Kerry's statement about climate change.