"Specialty:
a pursuit, area of study, or skill to which someone has devoted much time and effort and in which they are expert."
I'd change that word to better reflect what you really wanted to ask.
Yahoo and Bing also good search engines, due to several reasons they are far back now a days when compared to Google. Even yahoo answers provides the best answers, i dont think that Google leaves a chance for them as per their current business activities, so the same trend will follows for ever or any chances that yahoo or bing can compete with google in near future.

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