Every educator strives to inspire that special moment when a student gets it. Nat Geo staffers share their favorite “Ah-HA!” moments from school in the gallery below.

Photograph by Stephen Alvarez, National Geographic

© Photographerlondon | Dreamstime

Photograph by Jon T. Schneeberger, National Geographic

Photograph courtesy NASA/ESA

© Martinmark | Deamstime

Photograph by Maynard Owen Williams, National Geographic

Educators like you have stories, too, and we want to share them! Chat with us and each other on Facebook and Twitter using the #TeachNatGeo hashtag. We’ll share some of our favorites as the conversation grows.