The 90% Lie: What We Really Remember (And Why It Matters)

I recently spent a day leading a "Deep Learning Day" at a secondary school. I left exhausted and full of respect for teachers and students. But one thing I saw there truly shocked me. A notice in the staffroom listed how much people remember from different activities. It claimed: * 10% of what they read. * 20% of what they hear. * 30% of what they see. * 50% of what they see and hear. * 70% of what they discuss. * 80% of personal experience. * 90% of what they teach. This was unsettling. I earn my living writing articles and speaking on the radio. If this is true, 90% of my writing and 80% of my radio work is quickly forgotten. That is a lot of wasted effort. The data also explains modern problems. If you remember 70% of what you discuss with like-minded people, and 80% of your own experiences, your personal view can easily feel like the only truth. This is how echo chambers work. Furthermore, you remember 90% of what you teach others. This means you best remember the views you actively pass on, whether they are right or wrong. The notice taught me a deep lesson. It shows why real discussion and personal experience are so powerful. It also shows the limits of media that only talk at an audience. Every day really is a school day.