Every new web search starts with a question. Someone wants to know something and they type in a few choice keywords into Google and *poof* there's an answer.
It is very easy to search, but not so easy to find the exact answer to what is being asked. Microsoft is trying to capitalize on this idea by promoting their search engine as a "decision engine" that helps you find answers faster.
Google, on the other hand, has exploded their Universal Search results to include content from all forms of media. They also track what people clicked on in the past when searching similar keywords. They use the previous search history to help guesstimate answers for new searches.
All that said, sometimes someone does not know their next question until they are in the middle of reading about something else.
A young adult loo...
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