philosophy

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http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_philosophy This is a list of some of the major unsolved problems in philosophy .

List of unsolved problems in philosophy

40 Belief-Shaking Remarks From a Ruthless Nonconformist | Raptitude.com

If there’s one thing Friedrich Nietzsche did well, it’s obliterate feel-good beliefs people have about themselves. http://www.raptitude.com/2010/03/40-belief-shaking-remarks-from-a-ruthless-nonconformist/
The hedgehog's dilemma , or sometimes the porcupine dilemma , is an analogy about the challenges of human intimacy . It describes a situation in which a group of hedgehogs all seek to become close to one another in order to share heat during cold weather. http://en.wikipedia.org/wiki/Hedgehog%27s_dilemma

Hedgehog's dilemma

The Hardest Logic Puzzle Ever is a logic puzzle invented by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. http://en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever

The Hardest Logic Puzzle Ever