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Possible Duplicate:
Should the markdown renderer treat a single line break as <br>?

When using the editor to post questions or answer on SO, the line break is added by putting two spaces at the end of each line. My questions:

  1. Why does a simple not suffice here?
  2. What benefits does this scheme of formatting confer?

P.S: I am a noob as far as editors go and only use vim.

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