Selma Herndon Elementary School in Livingston traveled back in time Thursday during the opening of a 25-year-old time capsule. Alumni and now retired staff rediscovered old treasures and reminisced.

In many K-12 schools across the country ... teacher Lupe Fuentes waits with students for class to start at Selma Herndon Elementary. In California, for example, more than 1 in 3 kindergartners ...

But the sounds of chaos coming through the loudspeaker at Selma Herndon Elementary School were not genuine. They were part of training to deal with an active shooter. The training is part of a new ...

In many K-12 schools across the country ... teacher Lupe Fuentes waits with students for class to start at Selma Herndon Elementary. Preston Gannaway for NPR / Preston Gannaway In California ...