According to Aaron Wall, the result pages you see varies according to the data center, geographic loation and your  personalization option. This is the reason why people in different part of the world have will get different result pages for the same query. Matt Cutts was quoted saying - In fact, even at different data centers we have different binaries, different algorithms, different types of data always being tested.

Aaron talks in detail about the above factors. Visit the post.

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