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We use about 100 different sources including probably five different indexes on our own site -- indexes of different types for different things. When you type in a query what we really try to do is figure out what category it is (name query, technology product, etc.) and route it to that best source and return an instant answer from that best source. The thesis is that when you type in a query, most of the time you'd be better served if you had gotten an answer or some piece of data from a vertical site, say like TechSpot for certain things. But people often don't know what those sites are, so itís our job to figure out that site and format it at the top.