How often you use Search Engines? Which are your favorite ones?

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I normally open internet for using a search. I am a technical man and thats makes me many a times to go in for some technical references which are avaialable on the net.This not only saves my lot of time which I would have wasted in searchung the books but also helps me in keeping myself updated with recent developments in my field. After getting a connection of internet my expenses on purchasing the books has got drastically reduced. How about you do you often us Search Engine? I like Google better how about you ?