Let us try a thread where readers can try to summarize a true personal expertise or two that they have, regardless of source (academic, professional, or hobby, for example). Mine are going to be boring and narrow, so I hope other, more interesting folks will chime in. Here goes:

1. Legal liability issues arising from a common automobile sales practice known as "spot delivery." Spot delivery is when a dealer is arranging financing for a sale, but delivers the vehicle "on the spot" to the customer before financing is approved. Problems and lawsuits arise when financing falls through, and the dealer wants the car back.

2. Identification of common Warbler species by song, particularly identification based on an incomplete song, a note or two.