English: Two Penn tennis balls. On the left, a ball that has never been used. On the right, a ball after several hours of play.
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Digital Photograph
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Matt Kilroy
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{{Information |Description={{en|1=Two Penn tennis balls. On the left, a ball that has never been used. On the right, a ball after several hours of play.}} |Source=Digital Photograph |Author=Matt Kilroy |Date=7/26/2008 |Permission= |other_versions= }} {
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