In this new video from TED Education, teacher and author Jonathan Bergmann uses colorful analogies to help us visualize the scale of the atom and its nucleus. Bergmann is a pioneer of the "Flipped Classroom" teaching method, which inverts the traditional educational model of classroom lectures followed by homework. In a flipped classroom there are no lectures. Instead, teachers assign video lessons like the one above as homework, and devote their classroom time to helping students work their way through problems. To learn more about the flipped classroom method you can read a recent article co-authored by Bergmann in The Daily Riff. And to see more TED Education videos, which come with quizzes and other supplementary teaching materials, visit the TEDEd YouTube channel.