Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "Water and Dreams" [1]. The text only states that the book addresses the elemental substance of water and how it features in human lives, reveries, and poetry [1].
Therefore, it is not possible to answer what questions remain unanswered based solely on the given snippets.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Water and Dreams by Gaston Bachelard Categories: Imagination Snippet: "Water and Dreams" addresses the elemental substance of water as its plays through-out aur lives, our reveries, and our poetry, ranging from maternal and feminine waters to masculine waters that swimmers oppose.