A second question popped into my head while asking the first question.
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moon7296Thank you for the answer
1. Can I say 'A second question popped into while asking the first question.? (without my head) NO
2. I think I have heard a expression like came in to my head. Do you not say it instead of 'poped into my head?' That's ok
3. to appear or happen when you do not expect it <= this is the definition of 'pop up.'