This happens in environments where I have been expected to absorb large amounts of verbalised detail. School classes, lectures, extended meetings at work, those messy collaborative discussions between multiple people with limited social etiquette and so on.
I find I have to ask a lot of questions because I really didn't get the full picture.
A second reason for asking a lot of questions is that I'm generally not happy with what I perceive as the very superficial understanding that most people appear happy with. Even if I haven't had to deal with any of the difficult situations I listed above I find I need to clarify things.
I also find myself initiating discussions with others to clarify the meaning and implications of the various socio-political/community affairs at the office and in the wider company.
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On a clear day you can see forever