To get a handle on the size of data we are discussing, the amount of data stored in the US Library of Congress is sometimes used as a yardstick. As of 2007 it was estimated there are 10 Terabytes of data in the written works collection. The current storage of all US Academic research libraries runs at 2 Petabytes. Storing all the words ever spoken in the world is commonly assessed at 5 Exabytes. There is no warranty on the accuracy of the numbers, but they are indicative!
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