Or a new category, like "Ask HN" and "Show HN". Maybe call it "Hot HN" or "Hot <topic>" or something like that. Could be used for future hot topics too. If you

Or a new category, like "Ask HN" and "Show HN". Maybe call it "Hot HN" or "Hot <topic>" or something like that. Could be used for future hot topics too. If you change the link bold every time a hot topic is trending, it could be even used to show important stuff.