Teachers and students scribbled the lessons — multiplication tables, pilgrim history, how to be clean — nearly 100 years ago. And they haven’t been touched since. This week, contractors removing old chalkboards at Emerson High School in Oklahoma City made a startling discovery: Underneath them rested another set of chalkboards, untouched since 1917. “The penmanship blows me away, because you don’t see a lot of that anymore,” Emerson High School Principal Sherry Kishore told the Oklahoman. “Some of the handwriting in some of these rooms is beautiful.”