I think what people understand by destiny and liberty of choice is a bit limited and fantasist. There is only one world, and time only goes forward (by itself, if you do not go faster than lightspeed). So there is only one "possibility" of how things happen. Things happen the way they are and you can't change that. Our choices are influenced by everything, and of course, changing even one single particle 10 million years ago would have made an enormous difference today. So there IS destiny as in : things will happen in one precise way, but we DO have the choice to do something or the other, but once it's done, it's history and is part of destiny. Liberty of choice, and the science that studies why we make those choices, is a very very very very complex thing, but I think a super-supreme computer or mind (god perhaps), could tell exactly how everything is going to happen. We DO take choices as beings, but those choices are influenced by so many things that we don't know why we make those choices. There is an illusion in this, but the illusion is not that we have the choice. The illusion is to think you know WHY you did that choice.