What is the fine-grained topic of the following text: I actually got the treat of talking at length with Sheldon Brown on the phone once, and while I was probably one of hundreds that he spoke to that day, it was pleasureable, informative, and he took something like ten minutes talking with me about something so trivial I can't even recall what question I had at the time. Only return the topic.
Conversing with Sheldon Brown over the phone