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What is Knowledge?


 

Old wooden wheel
Plato defined knowledge as “Justified true belief”. For a person to know something he/she has to believe it, has to be able to justify it and it has to be true. This is explained here.

The tree criteria needed for a person to know something are:

  • Lack of justification: “I know that aliens exist” – there is no way that you can provide a justification for this claim. Therefore you can not know it.
  • Lack of belief: “I know that the world is round but I don’t believe it.” – this is a contradictory statement. For you to know something you have to believe in it. But not every belief is knowledge!
  • Lack of truth: I know that a circle has 3 corners. – You can not know things that are evidently not true.

Four possible ways to justify one’s belief are:

  • Memory
  • Authority
  • Logics
  • Empirical evidence

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In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.

- Karl Popper -