Deep in the deluge of knowledge that poured forth from science in the 20th century were found ironclad limits on what we can know. Werner Heisenberg discovered that improved precision regarding, say, an object’s position inevitably degraded the level of certainty of its momentum. Kurt GĂ¶del showed that within any formal mathematical system advanced enough to be useful, it is impossible to use the system to prove every true statement that it contains. And Alan Turing demonstrated that one cannot, in general, determine if a computer algorithm is going to halt.

Life - a dark sea of gloom and despair, lit only by brief glimmers of false hope.

## Friday, February 20, 2009

### Limits of knowledge

A mathematical theory places limits on how much a physical entity can know about the past, present or future

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