Popularity of body parts in history

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Try tracking the change in popularity of "eyes" vs "ears"

Rank - We count the number of books which use a word, and then rank all words (not just the ones shown). So in 1630 eyes is the 248th most common word (by the number of books that use it). Only ranking the top 1000 words in each year.

Uses/Books - shows you the average number of times this word in used per book (that has it in)

Originally the plan was to graph the top 1000 words between 1500-2000, and see how words like "duty" droppped of the face of the earth. Following a full day of getting the 500 millions line ngram database from Google processed down to a manageable 1000 words a year I discovered that Google Fusion + Motion Charts has a limit of 250 rows, hence switching to "body parts through history".

It also turns out Fusion + Motion chart isn't Y2K compatible and will only show years in two-digit form. Luckily Google Spreadsheet + Motion Charts doesn't have this bug and that's what I ended up using for the graph above.