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The questions of metaphysics are the deepest and most puzzling questions there are. What is time? Am I free in my actions? What makes me the same person I was as a child? What is it for one thing to cause another? Riddles of Existence is the first book ev

Metaphysics. --- Space and time. --- Philosophy. --- Mental philosophy --- Humanities --- Space of more than three dimensions --- Space-time --- Space-time continuum --- Space-times --- Spacetime --- Time and space --- Fourth dimension --- Infinite --- Metaphysics --- Philosophy --- Space sciences --- Time --- Beginning --- Hyperspace --- Relativity (Physics) --- God --- Ontology --- Philosophy of mind