An exabyte is a unit of information or computer storage equal to one quintillion bytes—an amount roughly represented by the number 1 followed by 18 zeros. Though the term is rarely encountered in any practical context, a popular, hotly contested assertion, which often cites as support a project at the UC Berkeley School of Information, is that "all words ever spoken by human beings" can be represented by approximately 5 exabytes of data. What is meant by the related term "exaflood"?

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