Sarah Hagan has a passion for math, and the pi-shaped pendant to prove it.

The 25-year-old teaches at Drumright High School in Drumright, Okla. The faded oil town is easy to miss. Fewer than 3,000 people live there, and the highway humps right around it. She’s now in her third year teaching at Drumright.

To Hagan, the average math textbook was, itself, a problem to be solved.

“I decided we were gonna make our own textbooks.”

Her students begin with blank composition notebooks, which become their textbooks. Each day, Hagan hands out a lesson she’s written herself or open-sourced from other teachers across the country. It’s usually printed on colored paper and requires some kind of hands-on work: drawing, coloring, cutting.

“The point is, we shouldn’t have to be like, ‘Oh, yeah, there’s that chart on page 763 that tells me how to classify something.’ They should think, 'Oh, that’s on that blue paper that we did a few days ago, and I doodled in the corner,’ ” she explains.

The Teacher Who Believes Math Equals Love

Photo and GIF credit: Elissa Nadworny/NPR

Nominated for the Best Cultural Documentary Emmy is Gallery’s “Deep Roots”, a profile of Oklahoma sculptor David Phelps. Phelps is internationally renown for a variety of his work, but he is perhaps best known in the state for his “Pastoral Dreamer” sculpture on the campus of the University of Oklahoma. Congratulations to Dave Tamez, Susan Miller, Bill Perry, Bill Thrash and Ryan Lorg. Watch the full episode.