CSS files that have numbers in their query string?

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Published on 2010-06-12T11:10:25Z Indexed on 2010/06/12 11:43 UTC
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<link href="/stylesheets/blueprint/screen.css?1268721265" media="screen, projection" rel="stylesheet" type="text/css" />
<link href="/stylesheets/blueprint/print.css?1268721265" media="print" rel="stylesheet" type="text/css" />

Why does the css file URL have 1268721265 in it?

Any ideas? Thanks.

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