Quantum effects don't manifest themselves on a macro-scale. We certainly used to think so, not so much any more. http://physicsworld.com/cws/article/news/2003/

Quantum effects don't manifest themselves on a macro-scale. We certainly used to think so, not so much any more. http://physicsworld.com/cws/article/news/2003/sep/03/entanglement-goes-macroscopic http://physicsworld.com/cws/article/news/2003/sep/03/entangl...