It’s clear that the building blocks of 21st century education are Minecraft blocks — especially for Joel Levin, the owner and co-creator of MinecraftEDU, which has partnered with the game’s developers to virtually transport students to ancient cultures and demonstrate the principles of quantum physics to seven year olds. As someone who hopes to incorporate Minecraft into every classroom, he uses Twitter to share YouTube tutorials, respond to questions from aspiring Minecraft educators, and retweet top student and teacher creations. —Olivia B. Waxman