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The FBI says it got a tip last month about the Florida shooting suspect, but failed to follow protocols to assess the threat.

Since the massacre at Columbine High School in 1999, school shootings have sparked debates on restrictions on purchasing and owning guns. As University of California - Los Angeles constitutional law professor Adam Winkler explains to NPR's Kelly McEvers, those debates have led to very few new federal laws.

Following the school shooting in Parkland, Fla., on Wednesday, many students are angry at what they see as politicians' inability to stop these massacres from happening. NPR's Kelly McEvers talks with Cameron Kasky, a junior who survived the shooting, about what he thinks needs to change moving forward.

There were Facebook groups and events inciting both left and right; fake identities to pay real people involved with rallies; and stolen U.S. identities used to facilitate payments for digital ads.

"There are people who go through life until they are 80 or 90 years old, desperate to let out their chicken. They die without doing so, which is a mistake," a Carnival reveler says.

Here are five takeaways from the indictment unveiled on Friday that charged a St. Petersburg troll farm and a number of individual Russians with waging "information warfare" against the United States.

Privately funded scientists made a virus related to smallpox from scratch, hoping their version might lead to a better smallpox vaccine. But critics question the need — and worry about repercussions.

Students are speaking out in Parkland, Fla., where 17 students and staff were killed. The young people hope their pleas for help in stopping future attacks are more effective than those in the past.

The world was moved by a viral photo of the 7-year-old girl, whose body was found on a trash heap in January.

Religion scholar Kate Bowler talks about battling incurable colon cancer. Critic Ken Tucker reviews the Black Panther soundtrack. Trucker Finn Murphy has logged more than a million miles on the road.