Basic algorithm for Reddit-like feed sorting?

If I have a feed of content each with a vote count. Any ideas on a basic sort mechanism to display this?

Like Reddit, I'd like:

* the content with the most votes to be toward the top

* but I also don't want old content to remain at the top (e.g. if only sorting by votes, the feed won't change often)

* but I also want to give new content some airtime toward the top (I don't want a separate 'new' page like Reddit does)

Here's what I'm working with:

$this->paginate = array(

'limit'=>30,

'order'=>array(

'Story.created'=>'desc',

'Story.votes'=>'desc'

));

Any ideas?

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