Education Dive – Lauren Barack 
A fascination with cryptography led high school math teacher Paul Kelley to develop a way to use the code-building practice to explain algebraic concepts to students at Anoka High School in Anoka, Minnesota. Kelley wanted to tap into ways math is used in everyday life — places where students would never give it a second thought — to spark their interest so they would stop asking how they would “use this stuff,” he said in an interview. (more)