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Just something to note: I lost 40 karma points in a day when I was only downvoted 20 points... some of which I deserved, but still, something didn't work as expected.

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I believe if a comment reaches -4 it doesn't go any lower, but every additional downvote is still subtracted from your Karma.

Can someone explain how to downvote something? I only see an up arrow next to posts.

You can down-vote after reaching a particular karma threshold.

At this point, you need 500 karma to downvote, per pg:

http://news.ycombinator.com/item?id=1853529

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