Bahram Kheradmand Posted over 2 years ago How do we prove an answer I would have to say human knowledge is now still too little for us to be able to talk about quantum mechanics in terms of big things as balls, tangible to human perception. I do agree that some materials might have characteristics that we are not yet familiar with, but you should always look at how science progresses, and although you are welcome to make smart extrapolations and hope to find something by designing smart experiments, you are not at all welcome to throw ideas (and insist on them without any proof) into the idea-space (literature, internet, whatever media) and expect to be regarded as legit. Andrew: True, but indeed human logic takes its raw data from human perception, or extended perception (high-tech). and the sentence about A being A and non-A at the same time is a semantically wrong. You could however say A is a system which could be in two states (s and s') at the same time. Semantics are very important because they determine how you think about stuff. The problem is that people think they understand the exact meaning of theories like Shrodinger's cat and then come to strange conclusions, which leads us to Michael : I have heard of it, but never observed it. Whenever I looked it was either dead or alive. The subatomic particles however were and were not there (and by "were" we mean "observable"). Assumptions are dangerous. Testable hypotheses are absolutely welcome.