4.9K views · 80 reactions | Twenty-five years have passed since 12 students and one teacher were killed in the Columbine massacre in Littleton, Colorado. At the time, the shooting on April 20, 1999, was the largest mass killing at a high school in U.S. history. Watch part of Amna Nawaz's interview with Tom Mauser, who lost his son, Daniel, at Columbine on that day. | PBS NewsHour | Facebook

17K views · 98 reactions | The presidential race struck a somber note today, on the 19th anniversary of the September 11 attacks. But how were the Democratic and Republican candidates different? PBS NewsHour's Yamiche Alcindor and Daniel Bush report. | PBS NewsHour | Facebook

7.7K views · 129 reactions | The U.S. Supreme Court heard arguments Wednesday in a case that could dramatically change how Medicaid recipients can choose their own medical providers. The case went before the court after South Carolina attempted to remove Planned Parenthood clinics from the state’s Medicaid program since it also provides abortions. Geoff Bennett discussed more with special correspondent Sarah Varney. | PBS NewsHour | Facebook

337K views · 10K reactions | WATCH: Joe Biden takes the oath of office and is now president of the United States. #inauguration to.pbs.org/2LSSZmu | PBS NewsHour | Facebook