Them...
If you thought "What the Bleep Do We Know?" was bad, I'd recommend the comments to this clip from Waking Life.
The view of physics presented in first part of the vid have long passed. The more modern view now, can be summed up in the phrase, 'Consciousness is the only true reality.' Einstein said it in a different way, "Matter is the optical illusion of consciousness." The power of your awareness, consciousness, determines your reality and defines 'who you really are.' The phrase 'free will' is misleading because it implies that you are only human but we are more, we are 'human beings.' The word being implies consciousness - the true reality. The phrase I Am sums up 'being' well. Eckhart Tolle talks about the ego (the false self). I suggest you read his books or listen to the audiobook verions. The ego has no free will. You do, however. You are much more than your mind. Your mind is a tool, only one of the many tools you have. Your reality is not predetermined exactly. If you bring awareness, consciousness, into what you are doing now, your consciousness changes reality outside of free will.
Yay! There's also the usual factoids and argument about quantum indeterminacy - nobody seems to catch on that how it might work (percolates up, consciousness causes collapse, blah blah blah, wank wank wank) is quite irrelevant to the argument in the clip.