"The Kekulé Problem" was published in 2017 in Nautilus , a magazine that blends science and culture. However, the search for a PDF version stems from the fact that the piece is often treated as an academic paper rather than a standard magazine column. It reads like a lecture, dense with insight and formatted with the precision of a scientific abstract. For many, downloading the PDF is the only way to properly annotate, study, and archive this brief but heavy text.

The story goes that Kekulé fell asleep by the fire and had a dream of a snake seizing its own tail—a mythical image known as the Ouroboros . Upon waking, Kekulé realized that benzene must be a ring.

McCarthy presents several provocative ideas about why our minds work this way:

The PDF’s central thesis—that the Kekulé Problem is a problem of alien cognition —is now a central question in artificial general intelligence (AGI) safety. In fact, several 2023-2024 arXiv papers cite Wallace’s essay directly when discussing the "interpretability" of deep learning models.

This discovery was revolutionary. It founded the field of aromatic chemistry and laid the groundwork for modern organic chemistry.

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Wallace’s essay is a case study in . Researchers use it as a citation when discussing how prior knowledge (Kekulé’s 10+ years of working on benzene structure) subliminally reassembles into novel patterns during sleep.

"The Kekulé Problem" was originally published in Nautilus magazine. You can often find the full text and downloadable versions through academic archives or the official Nautilus website. the specific biological arguments McCarthy makes.