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Conception Quote by Francois Jacob

“Contrary to what I once thought, scientific progress did not consist simply in observing, in accurately formulating experimental facts and drawing up a theory from them. It began with the invention of a possible world, or a fragment thereof, which was then compared by experimentation with the real…” quote by Francois Jacob
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“Contrary to what I once thought, scientific progress did not consist simply in observing, in accurately formulating experimental facts and drawing up a theory from them. It began with the invention of a possible world, or a fragment thereof, which was then compared by experimentation with the real world. And it was this constant dialogue between imagination and experiment that allowed one to form an increasingly fine-grained conception of what is called reality.”

Francois Jacob

About This Quote

Source Book: The Structure of Scientific Revolutions, Thomas S. Kuhn, 1962

Scientific progress arises from imaginative models tested against reality, not just passive observation.

In simple terms: Science advances by creating and testing imagined worlds.

Key Takeaway

Embrace imagination, then experiment.

Themes

science imagination methodology progress

Mood

curious inquisitive

Type

philosophical inspirational

When to use this quote

  • research labs
  • product development
  • policy design
  • education curricula

Key Concepts

model building hypothesis testing theory refinement

Questions to Reflect On

  • How do you balance creative speculation with rigorous testing?
  • What imagined models have reshaped your field?
A Different Perspective

Imagination alone cannot replace empirical validation.

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