During renovations, a high school in Oklahoma City recently discovered a series of old chalkboards under their existing ones, covered in writing that had remained untouched since 1917. The preserved boards include lessons on music, math, and even the history of the Pilgrims. It's a fascinating little time capsule from an earlier era, particularly since it was one that was always meant to be wiped away.

You find a lesson on pilgrims in every classroom. There was #aligned curriculum in #1917. pic.twitter.com/MurjKd8n6i — OKC Public Schools (@OKCPS) June 5, 2015

Music lesson from 1917. pic.twitter.com/bVRqU2hmT0 — OKC Public Schools (@OKCPS) June 5, 2015

Stuck in time. Drawings from 1917 uncovered during MAPS renovations at #Emerson pic.twitter.com/QDd2IlL3Sx — OKC Public Schools (@OKCPS) June 5, 2015

Incredible historical discoveries found inside Emerson High School during renovations!! #OKCPS pic.twitter.com/Uf3qL1NhAn — ChristineVanTimmeren (@C_VanTimmeren) June 5, 2015

Check out the date on this blackboard!! It's been hidden for almost 100 years! #OKCPS pic.twitter.com/q9DiP1wLk4 — ChristineVanTimmeren (@C_VanTimmeren) June 5, 2015

[via The Washington Post]