Your daily look at late-breaking news, upcoming events and the stories that will be talked about Thursday: 1. PAUL RYAN WON'T SEEK RE-ELECTION The decision by the House Speaker injects another layer of uncertainty as Republicans face worries over losing their majority in the fall. 2. TRUMP PROMISES MILITARY STRIKE Defying Russian warnings, the president says missiles "will be coming" in response to Syria's suspected chemical attack that killed at least 40 people. 3. WHERE KNOWLEDGE GAP IS APPARENT After two days of congressional testimony by CEO Mark Zuckerberg, what seems clear is how little Congress seems to know about Facebook, much less what to do about it. 4. IN EXTRAORDINARY LETTER, POPE ISSUES MEA CULPA The pontiff admits he made "grave errors" in judgment in Chile's sex abuse scandal and invites the abuse victims he had discredited to Rome to beg their forgiveness. 5. ALGERIA PLUNGED INTO MOURNING A military transport plane crashes after take-off in the worst aviation disaster in the African nation's history, killing 257 people. 6. HOW US WOULD RESTRICT SAFETY NET The Trump administration is considering a plan that would allow states to require certain food stamp recipients to undergo drug testing, handing a win to conservatives who've long sought to curb the program. 7. TARGET OF ATTACK KEEPING RUSSIANS AT BAY The daughter of poisoned spy Sergei Skripal says she has declined help from the Russian Embassy in the aftermath of the nerve agent attack that has left her ill and her father hospitalized. 8. WHO'S CHANGED HIS MIND ON MARIJUANA Former U.S. House Speaker John Boehner says he has had a change of heart on pot and will promote its nationwide legalization. 9. RESEARCHERS FIND LOWER ZIKA RISK Although signs of infection can be seen in men's semen for nearly a year, the risk of sexual transmission of the disease appears to fade in just one month, a study suggests. 10. BRINGER OF LAUGHTER DIES AT 87 Mitzi Shore, Pauly Shore's mother, owned the Los Angeles club the Comedy Store and was one of the most influential figures in stand-up for more than four decades.