A follow trail is a simple question that you can keep asking till you get to the root of something. Just continue to ask the question till you get to the source. You'll be surprised how powerful this one is. Follow trails are typically based on one-word questions, like: - And?/and? - Why?/why? - How?/how?
[Note: There wasn't actually a term for this, but it was an important concept so I made it up :)]
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