Twenty years ago, a pair of students killed a teacher and a dozen of their classmates a high school in Littleton, Colo. The shooters at Columbine High School used semiautomatic weapons and sawed-off shotguns in the attack before turning the guns on themselves.

Just a few months before that shooting, the FBI launched the National Instant Background Check System to try and prevent dangerous individuals from purchasing guns.

Is it possible to raise children without shouting, scolding — or even talking to kids with an angry tone?

Last month, we wrote about supermoms up in the Arctic who pulled off this daunting task with ease. They use a powerful suite of tools, which includes storytelling, playful dramas and many questions.

Inmates are among the least-educated people in America. That's despite research that shows education is one of the most effective ways to keep people from coming back to prison.

Now, there's renewed interest in giving adults behind bars better access to higher education. A new bipartisan bill in Congress would allow incarcerated people to use federal Pell Grants — designed for low-income students — to pay for higher education, including college classes and workforce training.

Updated at 3:04 p.m. ET

Senate Majority Leader Mitch McConnell, R-Ky., announced he will introduce national legislation to raise the minimum age for people buying tobacco products from 18 to 21. Some anti-tobacco advocates worry that the plan could actually harm children by heading off other regulation efforts.

You can read the redacted Mueller report right now, free, on the Department of Justice website. Or you can read it here on NPR.org.