Sometimes you want to find an old version of a webpage—Google's "cached" feature will display the lastest version of sites that are no longer online (most of the time). But suppose you want to find every version of a website?
Time to enter The Wayback Machine.
Browse through 30 billion web pages archived from 1996 to a few months ago. To start surfing the Wayback, type in the web address of a site or page where you would like to start, and press enter. Then select from the archived dates available. The resulting pages point to other archived pages at as close a date as possible. Keyword searching is not currently supported.
The Wayback Machine, which currently contains over 100 terabytes of data and is growing at a rate of 12 terabytes per month, is the largest known database in the world, containing multiple copies of the entire publicly available web. This eclipses the amount of data contained in the world's largest libraries, including the Library of Congress.

It drives me crazy when the President of the United States says "nucular" instead of "nuclear." It's not like the word doesn't come up very often. Can't someone pull him aside and whisper in his ear, "Uh. Mr. President. It's pronounced NOO-klee-ur."*
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