Why we make these
To take science back from the things that wear its clothes. Eugenics and behaviourism did not fail because they were too scientific. They took real mathematics — a curve built for observational error, a law of effect measured honestly in cats — and applied it to human beings without the discipline that made it work in the first place. That is what every chain in this collection turns out to be about.
Three things get mistaken for science and are its opposite. Pseudo-science, which has none of the method. Scientism, which keeps the authority and drops the practice — the p-value and the phrase evidence-based without the pre-registration, the blinding, the reported harms, the published null. And the smoothed popular retelling, which files off every hedge until a contested finding arrives as a fact, because the tidy version travels further.
When those tools get pointed at people, they flatten exactly the variation the science elsewhere insists is real — and they measure the surface, badly. The result is epistemic injustice with a citation attached, which is far harder to answer than a plain insult. So these chains are not arguments against evidence. They are arguments for the parts that got left behind on the way here.
What holds these together
This collection sorts by form, not by register — the same odd axis Field Guides sorts on, and we say so here rather than let it read as an oversight. Everywhere else on this site a piece follows one fact down. A chain follows many facts sideways, across a century or two, and what carries the argument is not any single fact but the handoffs between them.
The shape comes from James Burke's Connections (BBC, 1978), which Cosmic Connections already names as one of the two lineages inside this site's tagline — the other being Carl Sagan's The Cosmic Connection (1973). Burke's argument is that nothing in the modern world can be understood in isolation, because it was assembled out of centuries of unrelated people solving unrelated problems for reasons of their own, none of them aiming at what they produced.
The name is borrowed twice over, and honestly. How did we get here is the title of the paper underneath No. 39 — Randall, Ewing, Marr, Jimenez and Bourouiba's reconstruction of the five-micron myth. We noticed the phrase fit the whole form only after two of these existed.
Why the joints are marked
Here is the problem with the form, stated plainly: a chain is built to feel inevitable. Each link arrives just as the last one lands, the story accelerates, and by the end a reader has been persuaded by momentum rather than by evidence. Burke's chains are wonderful and some of his links are frankly loose. This site's standard is to verify everything and to say what we could not verify. Those two things are in direct tension.
So the form carries the epistemics instead of a footnote doing it. Every link is claimed at one of three strengths, said in the prose and drawn into the running spine at the foot of each spread:
This is not decoration, and the test is whether the mix is real. In No. 38: six documented, three contested, one leap — and the chain's own founding anecdote is among the contested ones, placed first so the notation is taught on the weakest link rather than the strongest. In No. 39 the load-bearing joint is marked contested because the paper reconstructing it will only call the connection likely, having found no explicit statement of it anywhere in the literature they reviewed.
What every chain here ends up saying
Nobody authored the road. Not one of the people in these chains was aiming at where it arrived. An astronomer wanted accurate transit times; a bacteriologist wanted to know how far a sneeze goes; an educator wanted children protected from arbitrary marking; an epidemiologist was preparing students for a real threat. Each solved their own problem competently, and could not have seen what it would join up with a century downstream.
That is not an excuse — the harm is not smaller for being unintended. It is a route. A thing that was accumulated can be dis-accumulated, one competent adjustment at a time, in the other direction. You do not have to defeat a conspiracy. You have to go back and read the citation.
Two pieces, and why that is enough to name it
Collections here are observed, not planned — the argument Cosmic Connections makes about the whole site. Eleven collections were noticed only after thirty-five zines had accumulated in no folders at all, and Field Guides waited until there were eleven of them.
So this page was deliberately deferred when the first chain shipped. It exists now because the second one arrived with the same shape, the same notation and the same ending, and because Stars We Grew Up On has been carrying two numbered zines for months. Two is the floor here, not a shortcut. The form was found in the work; the folder came after.
Not a conspiracy genre. The chains here are about accumulation, not design. If a piece in this collection ever reads as though somebody planned the outcome, it has gone wrong — that reading makes the history smaller, and it lets the accumulation off.
Not a licence to leap. The tags exist to make weak links visible, not permissible. A chain that needed three leap joints to reach its conclusion would not be publishable here; it would be a different, shorter piece.
Not history as inevitability. Every one of these chains contains a moment where somebody could plainly have done otherwise, and often somebody said so at the time and was ignored. Naming those moments is the point.
Not finished. Where a source could not be read at the primary, the piece says so on the page and the open item is logged. See the changelog for what we have got wrong and corrected.
The pieces
In the order they were made. The number records when; the collection records what.