1. The problem asks to identify two details included in the given text about messiness. 2. The text states that in one experiment, volunteers in a messy room came up with more creative uses for table tennis balls than those in a tidy room. 3. The text also mentions that there are many books and websites aiming to help sloppy people become tidy. 4. The other options about hiring professional organizers and clutter causing stress are not mentioned in the text. 5. Therefore, the two details included in the text are: - In one study, research participants in a messy room came up with more creative ideas than participants in a tidy room. - There are plenty of guides to help people combat messiness. Final answer: The two details included in the text are the first and third options.