This paper http://arxiv.org/pdf/quant-ph/0502072 http://arxiv.org/pdf/quant-ph/0502072 explores what it means for physical reality. It's really interesting. Th

This paper http://arxiv.org/pdf/quant-ph/0502072 http://arxiv.org/pdf/quant-ph/0502072 explores what it means for physical reality. It's really interesting. There are many possible scenarios, however. This blog post http://rjlipton.wordpress.com/2009/07/03/is-pnp-an-ill-posed-problem/ http://rjlipton.wordpress.com/2009/07/03/is-pnp-an-ill-posed... describes some of them.