

Tom liked to whistle. He whistled when he walked, when he played, and when he was happy. He learned to whistle from his dad, who whistled a lot too. Tom wanted to whistle like his dad, who could make different sounds and tunes with his mouth.
One day, Tom and his dad went to the park. They saw a big, modern building with glass and metal. Tom thought it looked shiny and cool. He asked his dad what it was.
"That's a museum, Tom. It's a place where people can see old and new things, like paintings and statues and machines. Do you want to go inside and look?" his dad said.
"Yes, please!" Tom said. He was curious and excited.
They went inside the museum and saw many things. Tom liked the colorful paintings and the funny statues. He also liked the machines that moved and made noises. He whistled along with some of them. His dad smiled and whistled with him.
They came to a room that had a sign that said "Rocks and Minerals". Tom saw many stones of different shapes and colors. Some were shiny, some were dull, some were smooth, some were rough. He wanted to touch them and feel them.
"Can I touch the stones, dad?" he asked.
"Sure, but be careful. Some of them are very old and fragile. And don't take any of them with you, okay? They belong to the museum," his dad said.
"Okay, dad," Tom said. He touched some of the stones gently. He liked how they felt in his hand. He saw one stone that was round and white. It had a hole in the middle. It looked like a donut. He thought it was funny and cute. He picked it up and put it in his pocket. He forgot what his dad said.
They left the museum and went back to the park. Tom and his dad played catch with a ball. Tom was happy and whistled. He felt the stone in his pocket. He wanted to show it to his dad.
"Dad, look what I found in the museum!" he said. He took out the stone and showed it to his dad.
"Tom, that's not yours. That's a fossil. It's a very old stone that has the shape of an animal that lived a long time ago. It's very rare and valuable. You can't take it from the museum. That's stealing. You have to give it back," his dad said. He was angry and disappointed.
Tom felt bad. He didn't know it was a fossil. He didn't mean to steal. He liked the stone, but he didn't want to make his dad mad. He wanted to do the right thing.
"I'm sorry, dad. I didn't know. I'll give it back. Please don't be mad at me," he said. He started to cry.
His dad hugged him and said, "It's okay, Tom. I'm not mad at you. I'm glad you told me the truth. You made a mistake, but you can fix it. Let's go back to the museum and return the fossil. Maybe they'll let you whistle with the machines again."
Tom nodded and smiled. He wiped his tears and whistled. He held his dad's hand and walked back to the museum. He hoped they would forgive him. He learned a lesson. He would never take anything that wasn't his again. He would only whistle.
