A few comments:

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I really like this idea especially for books owned, rather than read, just because it removes any timeline, or expectation of "reading more books is good". This is a really cool idea.

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I wish I had done this before I purged most of my books (except ones that I like to display)

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The outliers are fun, because it makes sense that longer books end up getting collected.

What is the low outlier in Science?