Why do north and north poles of magnets not attract?

Question: Why do north and north poles of magnets not attract?
- Keywords:
  attraction,
  magnet,
  physics,
  pole
Asked by 11jacksons to Christina, Colin, Jess, Samaneh, Steve on 19 Jun 2013.
- Steven Gardner answered on 19 Jun 2013:
  
  I think the reason is due the the way the structure of the magnet is aligned. It’s set up so magnetic field lines can only flow one way, if you try to force it to go the other way is resists.

Question: Why do north and north poles of magnets not attract?