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Fact/McGinn: not all facts can be seen, there are circumstances which no one can know. How do I know that? Do I not know the facts before I can know if I can know it? (E.g. number of blades of grass in the courtyard of the Yale University - e.g. Caesar on his third birthday.).
Die Grenzen vernünftigen Fragens Stuttgart 1996
Wie kommt der Geist in die Materie? München 2001