Wealthy citizens want to mine asteroids, Neil deGrasse Tyson plays "Bulls**t or No Bulls**t, Mitt Romney recalibrates his campaign, and Jason Segel works with humans.

Mayor Michael Bloomberg seeks a ban on oversized sugary drinks, Wyatt Cenac reports on Russia's blocking intervention in Syria, and Jim Parsons stars in "Harvey.

Democratic National Convention speakers praise President Obama, John Oliver shares a personal Obama anecdote, and Kirsten Gillibrand calls for more women in Congress.

Herman Cain denies sexual harassment allegations, Rick Perry loosens up, Wyatt Cenac reports on a dead bill, and Mindy Kaling discusses her parents' concerns.

The U.S. military kills Anwar al-Awlaki, Herman Cain talks about Rick Perry's ranch, and Thomas Friedman discusses America's role in the global market.

Newt Gingrich takes South Carolina, Al Madrigal gets to know Mitt Romney's most fervent enthusiast, and Kathleen Sebelius talks about health care reform.

Newt Gingrich emerges as the GOP front-runner, Sarah Vowell defends the glory of Evacuation Day, and Martin Scorsese talks movies.

Newt Gingrich wins the South Carolina debate, Stephen Colbert reveals his wishes for the Colbert Super PAC, and Liam Neeson enjoys small-town Canada.

A Koch-funded study debunks Climategate, riot police raid Occupy Oakland, and Lisa Randall explores the implications of scientific research.

Rick Perry drops out of the GOP race, Newt Gingrich's ex-wife reveals his request for an open marriage, and Elizabeth Banks enjoys performing on high-rise ledges.

Barack Obama gives his State of the Union address, Mitch Daniels counters it with a Republican rebuttal, and Paula Broadwell examines General David Patraeus' career.

Republicans identify America's American enemy, John Oliver tries to join Occupy Wall Street, and Calvin Trillin talks political humor.

Libyans celebrate Muammar al-Gaddafi's death, John Oliver rebrands Libya, and Richard Brookhiser discusses James Madison's impact on American politics.

Rick Perry goes birther, Republicans dislike Barack Obama's decision to end the Iraq War, and Kevin Clash talks about being Elmo.

Rick Perry and Herman Cain explain their jokes, Lewis Black examines the indoctrination of kids, and Walter Isaacson discusses his Steve Jobs biography.

Aasif Mandvi reports on Egypt's election, a fire alarm blares over Brian Williams' broadcast, and Bono believes that America is close to ending the AIDS epidemic.

Herman Cain suspends his campaign, John Oliver takes a closer look at California's political process, and Ben Lowy talks war photography.

The GOP censures Barack Obama's recess appointment, Jason Jones helps a Republican outcast, and Craig Shirley provides an intimate look at the attack on Pearl Harbor.

Newt Gingrich tackles an array of minority issues, John Oliver elevates America's public discourse, and Dolly Parton dukes it out with Queen Latifah.

Mitt Romney defends his tax returns, Newt Gingrich one-ups Mitt Romney at the Florida GOP debate, and Elizabeth Warren urges America to invest in its future.

Conservatives call Occupy Wall Street protesters anti-American, Florida votes to move its primary up, and Hugh Jackman boxes robots.

Fox News defends the rich, John Hodgman calls for a celebration of the 1%, and Condoleezza Rice discusses the Bush administration.

Police pepper spray U.C. Davis students, conservatives criticize Barack Obama for leaving God out of his Thanksgiving speech, and Merrill Markoe explores comedy.

Jon takes over the Colbert Super PAC, China's Foxconn comes under attack for its poor working conditions, and Jodi Kantor talks about the Obamas.

President Obama's role in Operation Fast and Furious inspires conservative talk of dictatorship, and Seth MacFarlane explains how he recruited Mark Wahlberg to star in "Ted.