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“Science uncovers the universe one discovery at a time. Curiosity fuels inquiry, and persistence transforms questions into understanding. Every experiment contributes to the mosaic of human knowledge.”

Last update Sept. 26, 2026. History

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“That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.”

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“I leave knowing that one of the things that makes us human is our curiosity, and one of the things that is the record of our curiosity is our knowledge.”

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“That's my answer to the question what is your strongest emotion, if you ever want to ask me: Curiosity, old bean. Curiosity every time.”

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“The master key of knowledge is, indeed, a persistent and frequent questioning.”

Peter Abelard Sic et Non

Introduction as translated in Readings in European History, Vol. I (1904) edited by James Harvey Robinson, p. 451
Variant translation:
Constant and frequent questioning is the first key to wisdom … For through doubting we are led to inquire, and by inquiry we perceive the truth.
Prologue as translated in A History of Education During the Middle Ages and the Transition to Modern Times (1918) by Frank Pierrepont Graves; 2005 edition, p. 53<!-- translation of Prima sapientiae clavis definitur, assidua scilicet seu frequens interrogatio … Dubitando enim ad inquisitionem venimus; inquirendo veritatem percipimus. -->
Sic et Non (1120)
Context: I have ventured to bring together various dicta of the holy fathers, as they came to mind, and to formulate certain questions which were suggested by the seeming contradictions in the statements. These questions ought to serve to excite tender readers to a zealous inquiry into truth and so sharpen their wits. The master key of knowledge is, indeed, a persistent and frequent questioning. Aristotle, the most clear-sighted of all the philosophers, was desirous above all things else to arouse this questioning spirit, for in his Categories he exhorts a student as follows: "It may well be difficult to reach a positive conclusion in these matters unless they be frequently discussed. It is by no means fruitless to be doubtful on particular points." By doubting we come to examine, and by examining we reach the truth.

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“Science is […] a way of skeptically interrogating the universe with a fine understanding of human fallibility.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

Charlie Rose: An Interview with Carl Sagan http://www.charlierose.com/guest/view/4553, May 27, 1996. <br class="br">Context: Science is [... ] a way of skeptically interrogating the universe with a fine understanding of human fallibility. If we are not able to ask skeptical questions, to interrogate those who tell us that something is true, to be skeptical of those in authority, then we’re up for grabs for the next charlatan, political or religious, who comes ambling along.

“Inquiry is the creation of knowledge or understanding; it is the reaching out of a human being beyond himself to a perception of what he may be or could be, or what the world could be or ought to be.”

C. West Churchman (1913–2004) American philosopher and systems scientist

Cited in: John Zeisel (1984) Inquiry by design: tools for environment-behavior research. p. 3
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