Each lesson plan follows the 20x20 PechaKucha format - 20 slides with 20 seconds of content for each. Educators have shown this to the most efficient way to learn new material and reinforce already-forgotten lessons. We then confirm the understanding with a 20-question quiz for each section - ensuring that each slide is understood. If youre not sure of the answer, then you can tap the hint to replay the 20-second blurb. All of the content downloads to your phone, ensuring that you dont burn cell data and that lessons work when you are off-line.