Do you have free will?

I don't know if I have free will. In fact, free will has never even be proven. Or brains could be simply reacting and shaping from a mix of both external stimuli and internal chemical configuration from birth. Let me set an example: Do this: slap yourself in the face really hard. Right now. Did you do it? If not, your body is simply telling you, "No, self-preservation!" or "Nah, too lazy" If so, then you are just really susceptible to suggestion. True free will can't be proven one way or the other, at least with our current technology.

Not to derail too much, but we have more along the lines of twenty or so senses. The five sense thing is old school thinking just like they used to say we only use ten percent of our brains, we would be dead if that were true. We are limited to what we know. There is an ungodly amount of information in this universe alone. If we knew everything, we could do anything. Where there are laws, there are ways to break them. What happens when we do? I guess we'll just have to find out. I'm one who believes most anything is possible, it just may not be how we think it ought to be. On my own, finite scale of things i'm very limited. I believe in a god/higher power/creator and i believe it knows what will happen, but doesn't just program us like robots to make it so. Understand all the variables and you may have an answer. To a degree, you can predict how a person will act or what they will say under any given circumstance if you fully understand all of the variables involved. Damn near impossible? You better believe it. My question is, what makes anything possible?