I just finished reading a fascinating article about some recent experiments testing quantum mechanics in Vienna. “The Reality Tests” by Joshua Roebke is a pretty good (if a bit technical at points) account of what I think are the most stimulating philosophical questions that are raised by the current science of quantum mechanics.
A few professors in Vienna are undergoing several experiments by which they hope (or hoped at this point) to successfully test whether realism or locality held true with physical measurements. In short, quantum mechanics holds that reality (especially on a quantum level) is actually projected outwards by your tools of measurement or perception–in an awkward Berkeleyan manner (thus the old addage ‘if a tree falls in the forest and no one’s there to see it, does it make a sound?’ gains a lot more traction). Read the article if you can stomach the complicated terminology for a good perspective on this interesting philosophical and scientific debate.