I’m in the early stages of researching adult ADHD and came across your post. I have not yet been diagnosed, but have scheduled a psychiatrist appointment. As of now, I have began making a list of circumstances and instances in my life that I believe may be related to the disorder. Needing further explanation is not on my list, but I can completely relate. Most of the time, I find further explanation on my own. For example, if I’m told my department is changing the way we complete a task I want an explanation and evidence as to why. If I don’t understand the “why”, I usually turn to Google or ask further questions until I “get” it. Whereas my coworkers will follow the instruction without hesitation, I question until I comprehend fully. I could see how this may be related to ADHD.