In human grid, we're the cogs

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<p><a href="http://www.physorg.com/news111664396.html">In human grid, we're the cogs</a></p> <p>Before you can post a comment to most blogs, you have to type in a series of distorted letters and numbers (a CAPTCHA) to prove that you are a person and not a computer attempting to add comment spam to the blog.</p>