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Who really said it

For a successful technology, reality must take precedence over public relations, for nature cannot be fooled

Written by Richard P. Feynman 1918–1988 · American theoretical physicist · Nobel laureate · Rogers Commission member
Confirmed word-for-word against the U.S. government’s own published text of Appendix F. Free to reuse

This one is real, and unusually easy to prove. It is the closing sentence of Appendix F: Personal Observations on Reliability of Shuttle, Feynman’s personal addendum to the Presidential Commission’s report on the Challenger accident, published June 1986 — and NASA still hosts the full text ↗, where the line appears verbatim.

Last verified 10 Aug 2026 · how we verify · spot an error?

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“For a successful technology, reality must take precedence over public relations, for nature cannot be fooled” Richard P. Feynman, "Appendix F: Personal Observations on Reliability of Shuttle," Report of the Presidential Commission on the Space Shuttle Challenger Accident, vol. 2 (June 1986)

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In context

Evoking the world of Richard Feynman — American theoretical physicist · Rogers Commission member. Theme: "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

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Minimalist editorial slide for the quote "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.

Provenance

The source

Work
Report of the Presidential Commission on the Space Shuttle Challenger Accident, Vol. 2 — Appendix F: Personal Observations on Reliability of Shuttle
Author of the appendix
R. P. Feynman
Published
June 1986 · Washington, D.C.: The Commission
Location in text
The closing sentence, ending the “Conclusions” section

NASA owes it to the citizens from whom it asks support to be frank, honest, and informative, so that these citizens can make the wisest decisions for the use of their limited resources.

For a successful technology, reality must take precedence over public relations, for nature cannot be fooled. Closing lines of Appendix F

The final two sentences of Appendix F, transcribed from NASA’s published text. Note the lowercase “nature.”

NASA: Appendix F — Personal Observations on Reliability of Shuttle

How we checked

  • Fetched NASA’s official text of Appendix F ↗ and confirmed the document ends with this exact sentence, byline “by R. P. Feynman.”
  • Corroborated the citation against the sourced entry at WIST ↗, which places the line in Appendix F and dates it June 1986.
  • Dated the report from NASA’s own catalogue record, which gives 6 June 1986 ↗; President Reagan’s remarks on receiving the final report ↗ are dated 9 June 1986.
  • Ruled out a look-alike source: Caltech’s Engineering & Science print of Feynman’s Challenger talk (Fall 1987, edited by Ralph Leighton) is a different text and does not contain this sentence, so it is not cited here.
Public domain

The sentence was first published in the report of a U.S. federal commission, and works of the United States Government are not subject to copyright. NASA’s own catalogue record for the Commission’s report carries the statement “Work of the US Gov. Public Use Permitted” ↗, and NASA publishes the complete text free of charge. One caveat: Feynman’s 1988 book “What Do You Care What Other People Think?” reprints the appendix and that book is in copyright as a book — quote from the government text, not the trade edition.

Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.

Fact-check

Right author, wrong paperwork

This is one of the rare famous-name quotes that survives scrutiny intact — Feynman really wrote it. What travels badly is everything around it: the spelling, the document it came from, and who is supposed to have signed off on it.

“… for Nature cannot be fooled” variant

The capitalised form is extremely common — Wikiquote’s Technology page uses it ↗ even though its Richard Feynman page does not. NASA’s published text of Appendix F ↗ prints a lowercase “nature.”

“The Rogers Commission concluded…” mis-sourced

It was not the Commission’s conclusion. It was Feynman’s personal appendix, which appeared only because he threatened to remove his name from the report ↗; his colleagues were alarmed by the dissent and included it after much petitioning.

A remark from the televised hearings written, not spoken

Even careful commentators cite it loosely — Edward Tufte’s notebook entry ↗ gives only “his report on the shuttle Challenger accident in 1986” and prints the capitalised form. The line is the final written sentence of a document, not something said at a hearing or during the famous ice-water demonstration.

Feynman’s 1988 book later reprint

“What Do You Care What Other People Think?” does include the appendix ↗, so citations to it are not wrong — but the first publication was the government report of June 1986, and that is the edition to cite.

Genuinely Feynman, and genuinely his own words: the last sentence of Appendix F: Personal Observations on Reliability of Shuttle, in the Presidential Commission’s report of June 1986, published in full by NASA ↗.

Context

Why it mattered

Feynman joined the Challenger commission as an outsider and stayed one. He concluded that NASA management had talked itself into failure odds wildly better than its own engineers believed — a finding that sat badly in a consensus report, and one that very nearly never saw print. He threatened to remove his name from the report ↗ unless his observations were included; they ran as Appendix F only after much petitioning by his fellow commissioners.

That backstory is what gives the last sentence its bite. It is not a summary of the Commission’s findings — it is the dissenter’s parting shot, written by the one member who refused to let the document close on a diplomatic note. Feynman put it at the very end of his appendix, after a paragraph arguing that NASA owed the public frankness about what the Shuttle could and could not do.

Nature cannot be fooled.

A note on the wording

The sentence circulates in two forms: with a lowercase “nature” and with a capitalised “Nature.” NASA’s published text of Appendix F uses the lowercase form, and so do Wikipedia’s article on the report and the sourced entry at WIST ↗. The capitalised variant is common enough that Wikiquote carries both spellings on different pages.

Feynman later reprinted the appendix in his 1988 book “What Do You Care What Other People Think?”, which is why some citations point there. That reprint is real, but it is not where the sentence first appeared.

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Filed under

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Trusted places to keep pulling the thread — primary archives, fact-checks, and scholarship. We show how we used each one before you leave.

Appendix F — Personal Observations on Reliability of Shuttlenasa.gov

NASA’s official full text of Feynman’s appendix. The quoted sentence is the document’s last line.
Rogers Commission Reporten.wikipedia.org

Background on the Commission and on how Appendix F came to be included after Feynman threatened to withdraw his name.
Feynman — Rogers Commission Report, Appendix Fwist.info

A sourced quotation database entry citing the line to Appendix F, dated June 1986, with the lowercase “nature.”
NTRS catalogue record for the Commission’s reportntrs.nasa.gov

NASA’s own bibliographic record, carrying the rights statement “Work of the US Gov. Public Use Permitted.”
Report to the President (Volume 1 scan)archive.org

Scanned copy of the Commission’s main report volume. Note: this is Volume 1 — Appendix F is in Volume 2.
Reagan’s remarks on receiving the final reportreaganlibrary.gov

Dates the handover of the Commission’s final report to the President at 9 June 1986.

The author

Richard P. Feynman

Richard Feynman

1918–1988 · American theoretical physicist · Rogers Commission member

Feynman was one of the twentieth century’s great theoretical physicists — a Nobel laureate for his work on quantum electrodynamics, and a famously plain-spoken teacher who distrusted jargon and authority in roughly equal measure. In 1986 he was appointed to the Presidential Commission investigating the loss of the Space Shuttle Challenger, where he became the investigation’s most visible sceptic. His Appendix F was a personal dissent, not a committee product, and it survives as the best-known thing the Commission published.

For writers & researchers

Cite this

Primary source

Richard P. Feynman, “Appendix F: Personal Observations on Reliability of Shuttle,” in Report of the Presidential Commission on the Space Shuttle Challenger Accident, vol. 2 (Washington, DC: The Commission, June 1986), closing sentence of the “Conclusions” section.

This verification page

Quotle.info. “Who really said ‘For a successful technology, reality must take precedence over public relations, for nature cannot be fooled’?” Last verified 10 Aug 2026. https://quotle.info/who-said/for-a-successful-technology-reality-must-take-precedence/

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