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Lee Sedol has lost three games in a row to Google's AlphaGo program, which means the program has officially defeated the human. Lee said the pressure was intense, and he felt "powerless."

For those sick of roses and chocolates, we've got a bracing dose of Valentine's Day bitterness — featuring cartoon heartbreak, real life heartbreak, tumultuous relationships and just a touch of hope here and there. Plus a bonus playlist from our friends at NPR Music.

Illinois, Wisconsin, New Hampshire and Pennsylvania top list of Senate seats most likely to change hands — and they're all currently Republican-controlled.

Also: Obama, Romney campaigns continue to spar over tax returns; U.K. and Sweden criticize Ecuador for giving asylum to Assange.

Also: Poll shows dead heat between Romney, Obama; Secret Service continues investigation into agents' conduct in Colombia; Ozzie Guillen returns to the dugout in Miami.

Also: U.S. resumes drone strikes against targets in Pakistan; Australian billionaire says he's building "Titanic II;" chances of military action against Iran are lower, experts say.

Also: Skype to make chats and user data more available to police; Obama and Romney differ over gun control; Chinese politician's wife charged with murder.

Also: Refugees race to escape fighting in Syria; Palestinians outraged by Romney's comments; grid failure cuts power to 370 million in India; McCain dismisses Cheney's criticism of Palin pick.

Also: It's Day 3 for health care cases at the Supreme Court; passengers recount captain's bizarre behavior on JetBlue flight; Mega Millions jackpot hits record $476 million.

Also: Chicago teachers' strike continues; Buckingham Palace takes legal action over topless photos of Kate; Occupy movement marks one-year anniversary; new iPhone sets sales record.