I have devised a thought experiment to test the Copenhagen interpretation. Let's say we have an elementary particle which has a 50% probability of emitting an alpha particle in an hour. We have a measuring device which is allowed one hour to measure whether or not an alpha particle is emitted. If an alpha particle is detected, then a signal is sent to an apparatus which causes a sperm to meet an egg cell in a test-tube. Let's say that the lab is constructed in such a way (use your imagination.....it's the <whisper-voice>future</whisper-voice>) that the subsequent baby created will grow, have proper nutrients and what-not, so that we can check back in 15 years to see if there is a teenager there (the child will not be allowed to interact with any person or leave evidence of its existence outside the lab). But we leave language-learning material in this lab such that the child, if sufficiently clever, can learn to speak on its own. Now we check back in 15 years, and if there is indeed a teenager, we ask him, "how long have you been alive?" If he says, "15 years", then the alpha particle was emitted irrespective of any observation.