Dad: Do you have any biographies of scientists, in particular volcanologists?
Me: What was the subject? (looking at it written down is easier than hearing it and wondering what he = saying)
Dad: Volcanologists. I think that's how it's pronounced. (The kid agreed).
Me: (now that I know he wants to study volcanoes...) Let me look for some material.
I satisfied his information needs for the day because I found a book called Volcanologists as well as career encyclopedias, books about volcanoes, books about being a scientist, even a book called Volcanology.