To celebrate four years of NPR's Student Podcast Challenge, we highlight teachers whose students have shined.

An assistant director unwittingly handed Alec Baldwin a loaded weapon and told him it was safe to use, in the moments before the actor fatally shot a cinematographer, unsealed court documents show.

It's the stuff of nightmares, or science fiction: a parasite that wants to get inside an animal's mouth, where it attacks — and replaces — the tongue.

A former science teacher who's been blind for 16 years became able to see letters, discern objects' edges — and even play a Maggie Simpson video game.