quarterbuck writes: "While Google is saying that personalization is the key to search, Yahoo is taking a different view of the topic. Yahoo announced plans to retain user data for no longer than 90 days and to anonymize data. Even if Yahoo is not your favorite search engine, it is a good move in the direction of online privacy if it will force others to follow suit." Link to Original Source
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"