A man who designs and builds amusement park rides tells Professor Pringle how he makes mucus fun, explains why sheer terror is the secret to a good thrill ride and how a merry-go-round can teach children the facts of life.

Professor Pringle visits a cookie company where he discovers the link between infants and cookie craving, the strict hand of the International Cookie Federation, and why a cookie is sometimes the best medicine.

Professor Pringle learns about the world of online gaming, the excitement of flying an airliner while sitting at his desk, and the fun of doing hard time in solitary confinement, when he interviews a video game designer.

A professional treasure hunter tells Professor Pringle about the joys of discovering riches in your own backyard, the secret maps lurking in coffee shop menus, and his quest for the one ring to rule them all.