Google keeps tweaking its search engine

These days, Google seems to be doing everything, everywhere.

It takes pictures of your house from outer space, copies rare Sanskrit books in India, charms its way onto Madison Avenue, picks fights with Hollywood and tries to undercut Microsoft's software dominance.

But at its core, Google remains a search engine. And its search pages, blue hyperlinks set against a bland, white background, have made it the most visited, most profitable and arguably the most powerful company on the Internet. Google is the homework helper, navigator and yellow pages for half a billion users, able to find the most improbable needles in the world's largest haystack of information in just the blink of an eye.

Yet however easy it is to wax poetic about the modern-day miracle of Google, the site is also among the world's biggest teases. Millions of times a day, users click away from Google, disappointed that they couldn't find the hotel, the recipe or the background of that hot guy. Google often finds what users want, but it doesn't always.

That's why Amit Singhal and hundreds of other Google engineers are constantly tweaking the company's search engine in an elusive quest to close the gap between often and always.

Singhal is the master of what Google calls its "ranking algorithm"--the formulas that decide which Web pages best answer each user's question. It is a crucial part of Google's inner sanctum, a department called "search quality" that the company treats like a state secret. Google rarely allows outsiders to visit the unit, and it has been cautious about allowing Singhal to speak with the news media about the magical, mathematical brew inside the millions of black boxes that power its search engine.

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