How do we speak well as preachers on subjects that are not in our wheelhouse? These are important subjects, but they're complicated, and require a level of knowledge and expertise in order to be helpful.
I remember a story in the life of our church where I'm preaching - I can't even remember the text; I can't remember the exact point I was making, but I was making some medical illustration - and I didn't know what I was talking about. It was stuff that I probably Googled or looked up on Wikipedia or something like that.
Now one thing you should know is that we have a nursing school in Athens, and we have nurses and nursing students in our church. So I'm rattling on with all of my knowledge gleaned from Wikipedia and I can distinctly remember two of our nurses sitting in different parts of the crowd, both shaking their heads, "No. No, what you're saying is not true."