You've probably seen it a thousand times and even thought "Hey, why not?" but it never seems to work, says ReadWriteWeb. Don't worry - you're not alone - and this weekend NPR ferreted out the story behind the ever present and never functional "Free Public WiFi". Everywhere you go, there it is...but it isn't because the government finally started offering ubiquitous WiFi for public use without you knowing. Instead, it's a bug in Windows XP that started years ago and has spread computer to computer, like a virus. According to wireless security expert Joshua Wright, the bug has been around...

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