Today's reading tells about a man who invented a special kind of glue. It was so special that it DIDN'T HOLD ANYTHING TOGETHER. (Not a great glue, right?) But another person discovered that even though it didn't actually glue things together, it was strong enough to hold a piece of paper, his bookmark, in a book. He used to glue that was useless to make Post-It notes!
Just think, Post-It notes were invented only because another invention failed. I'm so glad they were invented because now we can stick notes everywhere and watch cool videos like this one.