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Time is still the great mystery to us. It is no more than a concept; we don't know if it even exists. - Clifford Simak Time is still the great mystery to us. It is no more than a concept; we don't know if it even exists. - Clifford Simak Time is still the great mystery to us. It is no more than a concept; we don't know if it even exists. - Clifford Simak