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I just finished two rooms with hardwood flooring. I was told that the
flooring should go perpendicular to the joists. In one room I
remembered that. In the other I forgot.

The floor is nailed to the subfloor so it is not a question of falling
apart. I'd run it the way it looks best. This has been discussed before,
but there has been no evidence of any problems going in a different
direction.