Once upon a time, there was a little bird named Billy. Billy had a small, fragile nest up in a tree. He loved to sit in his nest and sing happy songs all day long.
One day, while Billy was sitting in his nest, he saw a tiny cell on a leaf. The cell was very small and all alone. Billy felt sad for the little cell and wanted to help it.
Billy thought of a plan. He would sit by the cell and sing a beautiful song to make it feel better. The cell listened to Billy's song and started to grow. Soon, the cell was not alone anymore, and it had many friends on the leaf. Billy was happy that he could help the cell, and they all lived happily ever after.
