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Two weeks, two 18-year-olds committing acts of mass murder in the United States of America.

18-year-olds murdering black people at a grocery store, murdering children at an elementary school.

In Buffalo, we know the shooter was radicalized by online extremism.

The other one, we don't know yet, he was definitely posting online about

what he was going to do at this school before he went to do exactly what he said he would

in Uvalde, Texas. The internet is treacherous enough for adults, but the teens,

we wanted to figure out how parents can stop their kids from getting radicalized online.

And we found a mom who tried.

And the first time I heard like an eight-year-old scream to the N word,

it was like, okay, here's the conversation we need to have.

How to have a little more faith, your kids aren't being radicalized online,

coming up on Today Explained.

It's Today Explained. I'm Sean Ramos from I don't have any kids, but I know a lot of you do,

and when I'm around my friends or family members who have kids with smartphones,

I always ask, so like, what boundaries are you setting there?

Sometimes I'm really impressed by the answer, sometimes I'm petrified,

because some parents I've spoken to aren't doing much at all.

They're placing a whole lot of faith in their kids to do the right thing.

I didn't think much about kids like fine falling into any kind of dangerous ideology,

...