People want to know why things happen. It’s important to know a cause. For example, once you know what has made someone sick, you may be able to figure out how to make that person well.

As you read the next story, try to find the cause of what is happening.

People at Rob’s Shoe Repair Shop found out some strange things about shoes. They looked at the shoes of the right foot and then the left foot. Most of the time, the right shoes wore out faster than the left shoes.