In this episode of Testing Testing, we explore the science behind the perfect level of challenge for learning. Researchers have discovered that the ideal success rate for rapid growth is about 85% - not too easy, not too hard, just right. We break down what this might look like in classrooms, how teachers can apply it to differentiate instruction, and why managing emotions like frustration and embarrassment is key to success. Tune in to learn how this simple rule could transform the way we teach and learn.