【Alice Yeh】評論
Meanwhile, Art Fry felt frustrated that his bookmarks kept falling out of his hymn book when he sang hymns during the church service. He wondered if there was a note that could help him mark the right page without damaging the book. Suddenly, he remembered Silver’s invention─the weak glue. He came up with an idea to use the weak glue on a piece of paper. Thus, the bookmarks could attach to his hymn book.