At a conference in San Francisco meant for startups, Google search-and-cupcake czar Marissa Mayer is currently live-demoing Google's latest launch, a news archive of scanned newspaper stories that goes back decades. The archive's scope of how many newspapers, over how many decades, isn't clear from Mayer's presentation or Google's blog post. Mayer says the project uses Google's book-scanning tech, adapted for newsprint archives.

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