 People, they joke about why don't people remember the pastor's sermon, Sunday sermon on Wednesday, because you only remember 10% of what you hear. If you hear it and see it, you remember a little more. You remember 15 to 20. But if it's heard, seen, and sung, you can remember 40 to 50% of things. That's why people remember elderly when they're dying. The one thing they remember are the hymns they learned as children.