See the interesting essay No Physical Substrate, No Problem: http://slatestarcodex.com/2015/04/07/no-physical-substrate-no-problem/ http://slatestarcodex.com/20

See the interesting essay No Physical Substrate, No Problem: http://slatestarcodex.com/2015/04/07/no-physical-substrate-no-problem/ http://slatestarcodex.com/2015/04/07/no-physical-substrate-n...