Once upon a time, there was a girl named Sue. She liked to design clothes for her dolls. One day, she made a dress with a zipper. The zipper made it easy to put the dress on the doll.
Sue showed her mom the dress. Her mom said, "Wow! That zipper is very useful! Good job, Sue!" Sue felt happy and proud of her work.
Sue kept designing more clothes with zippers. All her friends loved them too. Sue learned that making useful things can make people happy. And that made Sue happy too.
