Go Away Worries!: Put Them in the Worry Jar

Caleb doesn't know what to do. His hands are sweaty, his heart beats fast, and his stomach is upset way too many times in a day. Why are there so many things to worry about? But when Miss White, his fourth grade teacher, suggests a way to deal with his worries, Caleb isn't too sure it'll help. What is a worry jar and how is it the answer?