Why Fish Don't Exist

Miller braids the strange life of David Starr Jordan, a nineteenth-century ichthyologist who catalogued thousands of fish species only to watch a catastrophic earthquake shatter his life's collection into an unlabeled heap, with her own struggle against personal chaos and despair. Jordan's response to disaster — reconstructing specimens and pushing forward with obsessive resolve — initially reads as inspirational, until Miller's research uncovers his darker history advocating for eugenics, revealing that his relentless drive to impose order on nature was entangled with a desire to impose hierarchy on people too.

The book matters because it delivers a genuine scientific gut-punch: cladistics, the modern method of classifying life by evolutionary ancestry, reveals that "fish" is not a coherent biological category — lungfish are more closely related to cows than to salmon. This isn't a cute trivia fact; it's Miller's central metaphor for how confidently we build categories, hierarchies, and taxonomies onto a world that resists them, and how much damage that confidence can cause when categories become excuses for ranking people.

Who should read it

Readers who enjoy science writing braided with memoir, and who are comfortable with a book that undercuts its own inspirational setup partway through, will find this rewarding and genuinely surprising. It suits anyone interested in the history of taxonomy, the ethics of scientific certainty, or how personal crisis can reshape how we read history.

About the author

Lulu Miller is a science journalist and co-founder of NPR's Invisibilia podcast. Why Fish Don't Exist, her debut book, blends investigative research into David Starr Jordan's life with her own personal narrative.