Imponderables: Answers to the Most Perplexing and Amusing Mysteries of Everyday Life (Unabridged)
2021년
Do Penguins Have Knees? (Abridged)
2006년
When Do Fish Sleep and Other Imponderables (Abridged)
2007년
WHY DO CLOCKS RUN CLOCKWISE (Abridged)
2006년
How Does Aspirin Find a Headache? (Abridged)
2006년
When Did Wild Poodles Roam the Earth? (Abridged)
2006년