James learns quite a lot about water displacement when his drog, Rupert, unexpectedly joins him in the bathtub.
| Author | Bob Graham |
| Publisher | Zero to Ten |
| Year of publication | 2000 |
| Number of pages | 24 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 1840891319 |
| ISBN-13 | 9781840891317 |
| Illustrator | Bob Graham |
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