Today we were confronted with Jim Holt's Why Does the World Exist  It is written like a detective story and it is metaphysical but it is more fun than you might think.  He tries to answer the question why is there something instead of nothing?  How does all this cosmological stuff get involved with a non-zeros probability?  We enjoyed exploring some deeply philosophical ideas, but to get to the good stuff, I recommend you to the book and to the people who understood more about this than I do: