The Google Books Ngram Viewer ( lets you graph and compare phrases from 5.2 million books (that's half a trillion words!) digitized by the Google Books team over time, showing how their usage has waxed and waned over the years.

Recently one digital humanities researcher turned to the Ngram Viewer to answer a question that's piqued the interest of many a pop-culture fan lately: just how historically accurate is the dialogue of Downton Abbey, anyway?

Read more on what he found:
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