It seems that Google corrected the fault of subtraction which has been discovered a few months ago. For more details on this fault you can read my article entitled "Google can't subtract". Now, 1-0.9-0.1 gives 0 as result and not -2.77555756E-17 any more:
(A link from Google Blogoscoped)
If you think that you know what Google Robots are and what they can do and are good for, you're wrong. Here is the official FAQ for Google Robots. The FAQ was last updated November 1st, 2030.

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For April Fool's Day - 2002, Google submitted a page that explains its search technology. May be you have heard about it. PigeonRank is the heart of Google's search technology,a system for ranking web pages developed by Google founders Larry Page and Sergey Brin at Stanford University.

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