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How come this post is not in the first page after 8 hours while the following post for example still is?

Joel Spolsky: Lunch (joelonsoftware.com) 275 points by alexlmiller 12 hours ago | flag | 175 comments

"Ask HN"-types posts (i.e. without a link) are heavily disadvantaged. They take more upvotes to get to the front page, and fall down faster.

is there an explanation for that?