in reply to Re^2: Thread to read a file every second
in thread Thread to read a file every second

It didn't. This is called a threaded view (parent/child). By default its chronological. Example 
perlquestion
- 1st reply to perlquestion
  - 1st reply to 1st reply to perlquestion
- 2nd reply to perlquestion
  - 1st reply to 2nd reply to perlquestion
- reply 3
- reply 4

[download]
It doesn't matter if 1st reply to 1st reply to perlquestion got created after 2nd reply to perlquestion, its not a reply to perlquestion.

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