set hotness with score+1 so a single downvote doesn't kill it

app/models/story.rb

@@ -245,7 +245,8 @@ def fetch_story_cache!
  end

  def calculated_hotness
    order = Math.log([ score.abs, 1 ].max, 10)
    # don't immediately kill stories at 0 by bumping up score by one
    order = Math.log([ (score + 1).abs, 1 ].max, 10)
    if score > 0
      sign = 1
    elsif score < 0
@@ -257,7 +258,7 @@ def calculated_hotness
    # TODO: as the site grows, shrink this down to 12 or so.
    window = 60 * 60 * 48

    return -(order + (sign * (self.created_at.to_f / window))).round(7)
    return -((order * sign) + (self.created_at.to_f / window)).round(7)
  end

  def score