The physics. Aristotle's account of natural motion — bodies moving toward their proper place, speed increasing with weight and decreasing with the density of the medium — is given from the standard reading of the Physics and On the Heavens rather than from a translation quoted here. Galileo's self-contradiction argument (tie a heavy body to a light one and the same premise predicts both faster and slower) is in Two New Sciences (1638), as is the inclined-plane work establishing that distance goes as the square of time independent of weight. The Leaning Tower demonstration is marked contested on its own spread: it comes from Vincenzo Viviani's biography, written decades after Galileo's death, and Galileo does not describe it in his own published work — the most famous experiment in physics is a story about an experiment, which is exactly the smoothing this collection exists to catch. Newtonian mechanics is described structurally rather than quoted.
Apollo 15. On 2 August 1971, at the end of the final Hadley–Apennine moonwalk, commander David Scott released a geology hammer and a falcon feather simultaneously and they reached the surface together; the demonstration was televised and Scott remarked that it confirmed Galileo. His words are paraphrased rather than quoted here, having not been checked against the mission transcript.
Self-esteem. The California Task Force to Promote Self-Esteem and Personal and Social Responsibility was established in 1986 and published Toward a State of Esteem in 1990. Its commissioned academic volume — Andrew Mecca, Neil J. Smelser & John Vasconcellos (eds.), The Social Importance of Self-Esteem, University of California Press, 1989 — reported that "the associations between self-esteem and its expected consequences are mixed, insignificant, or absent."
Growth mindset. Brooke N. Macnamara & Alexander P. Burgoyne, "Do growth mindset interventions impact students' academic achievement? A systematic review and meta-analysis with recommendations for best practices," Psychological Bulletin (2023; online first 3 November 2022) — 63 studies, N = 97,672; publication bias, authors with financial incentives more likely to report positive effects, major internal-validity threats, and higher-quality studies less likely to show benefit. Carol Dweck's warnings about "false growth mindset" and its misuse, and Angela Duckworth's caution against grit measures in high-stakes accountability, are characterised rather than quoted; both are well documented in their public writing but were not read at source for this piece, and are flagged here as open.
The correction. The line usually given as "Every great cause begins as a movement, becomes a business, and eventually degenerates into a racket" is a misquotation. Eric Hoffer, The Temper of Our Time (1967), essay "The Negro Revolution": "What starts out here as a mass movement ends up as a racket, a cult, or a corporation." The circulating version converts three parallel outcomes into a three-stage moral decline and drops the specificity of here. We had used the smoothed version, from We Don't Need Your Mindset Marketing at Stimpunks, which is the source this zine grew from; the correction is logged in FACTCHECK.md as open there.
The medium. Sendhil Mullainathan & Eldar Shafir on scarcity, bandwidth and slack; Linda F. Nathan's five dangerous assumptions, from When Grit Isn't Enough; Ben Williamson on SEL as the product of "psy entrepreneurs, global policy advice, media advocacy, philanthropy, think tanks, tech R&D and venture capital"; and Paul Gorski's equity literacy — "Equity literate educators reject deficit views that focus on fixing marginalized students rather than fixing conditions that marginalize students." These are carried from the Stimpunks essay and its citations rather than re-traced to each primary, and are marked open on that basis.
Held honestly. Three joints are contested and argued in place: the tower story (spread 3), the physics-to-deficit-ideology transfer (spread 6, where the note states plainly that children are not projectiles and mechanics is no authority on pedagogy), and the market-as-primary-driver claim (spread 11, which declines to let a satisfying monocausal story stand in for evidence). One joint is a leap — remove the air and the difference vanishes, spread 12 — and it is the first leap joint in this collection. It is marked because it is the sentence a reader most wants to be true, and because the strong version is actively dangerous: if gaps must vanish when barriers are removed, a persisting gap becomes proof the barriers are gone. Two chains in a row had come back leap-free and the colophons flagged that as worth watching; this one fires all three tags, which is what the notation is supposed to do when the material calls for it.