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About this quote

What does it mean?
A chain reaction requires that each fission event releases neutrons that trigger further fission events.
In plain terms
To keep a reaction going, each step must start more steps.
What can you take from it?
Sustainable systems need self-reinforcing loops.

Where it applies

  • reactor design
  • process engineering
  • policy

Putting it to work

  • design feedback loops
  • ensure stability
  • measure output

Questions to consider

  • What makes your system self-sustaining?
  • Where are the weak links in the chain?

Another view

Uncontrolled feedback can lead to runaway effects.

More from Enrico Fermi

  1. Never underestimate the joy people derive from hearing something they already know.

    Permalink to quote #11
  2. Whatever nature has in store for mankind, unpleasant as it may be, men must accept, for ignorance is never better than knowledge.

    Permalink to quote #13
  3. Never be first; try to be second.

    Permalink to quote #10

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