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Re:Ask HN: Please review our startup: historious by RiderOfGiraffes on Sunday August 15, 2010 @05:49PM (#1606053)
From the FAQ at the bottom of every page:

http://ycombinator.com/newsfaq.html

    Why don't I see down arrows?

    There are no down arrows on submissions. They only
    appear on comments after users reach a certain karma
    threshold.
Re:Ask HN: Please review our startup: historious by StavrosK on Sunday August 15, 2010 @06:10PM (#1606101)
That's the odd thing, I saw them one day and then they went away again. It's no big deal, I was just wondering, thank you.