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"Welcome to Google Instant. Feelings of euphoria and weightlessness are normal. Do not be alarmed."

Google Instant is rolling out over several days to users signed in to a Google Account. Check back soon if you are signed in and do not see it yet.
Google Instant is a new search enhancement that shows results as you type. We are pushing the limits of our technology and infrastructure to help you get better search results, faster. Our key technical insight was that people type slowly, but read quickly, typically taking 300 milliseconds between keystrokes, but only 30 milliseconds (a tenth of the time!) to glance at another part of the page. This means that you can scan a results page while you type.
Google Instant can save 2-5 seconds per search!
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P.S: That actually means that Google will save me roughly 3 hrs of my life! Thank you! Thank you! Thank you!