Lets try Medical. This is always a fun way to work out illusions. Now this will take a sec so please be patiant, but this is a lot of fun. Lets imagine a man called Dave walks up to you in the street, shakes you by the hand and says "hi, im Dave, Im 36 years old. Nothing strange? well not quite and here´s why. First we need some medical backround on Dave, now this will take a sec but please follow as it is much fun... Now, Dave´s liver has to replace it´s self, partical for partical, atom for atom even electron for electron, every 500 days or so he has a new liver, now this is a genetic copy from the last one BUT it is slightly older, A good example to this would be like walking in to a dodge truck dealership and saying, "I have an 8 year old Dodge I like to part ex... for that 8 half year old Dodge over there". Now so what are you going to say, so what if he has a new liver, I do not care! well just a little further... The hardest structure in the human body to replace is the skeletal structre, this takes a full 10 years, but like clockwork evey partical, atom and electron is complealty replaced for a new one... So what your going to say again.. Well this is the point, When the man Dave came up to you and said "Hi I Dave" im 36 and shook you by the hand, he was lying to you... there is not a single cell in Dave´s body more than 10 years old, he could have also said he was a flying elephant, it would make this any more true, he just belives he is dave who is 36.... just thoughts, thats all... Now the phycics of the hand shake, now there´s an illusion...