Every object is made up of molecules, which are made up from atoms, which are made up from protons, neutrons and electrons, which are made up from quarks
All these particles effect each other, they change each others' speed, angle maybe change the element of another particle by fusing with it (think about stars)
And it all (probably) started from a singularity 12 billion years ago, better known as the big bang, at this instant every particle chose it's own path through the galaxy, which cannot be changed anymore
If we were to cause a change on an atom, eg: fusing to atoms together
This change was destined to be, because we are made up from molecules/atoms too.
So the choices made by us, were already layed out for us 12 billion years ago
I give an example of what I mean because I fear I can't express myself good enough in English to explain this
Say, you are in the local store, trying to decide whether you should pick soda or coke
Say, there are only two active brain cells at this moment and they sorta vote for what you should pick, one chooses coke the other picks soda
Now there's one other brain cell (made up from atoms) This brain cell sides with the coke, so you pick coke to drink
The atoms inside this braincell (the third cell) are 12 billion years old, they have traveled gigantic distances, from the center of the universe to end up here on earth, once they were inside a star, after that star exploded they were scooped by a meteor, which then crashed on earth (all these objects are made up of atoms, which fallow their own path through the universe)
Millions of years later life began to evolve on earth, your brain's atoms' have been the building blocks of all sorts of organisms, alive or otherwise
To then finally end up in your brain, picking coke or soda...
Because all particles effect each other, everything that is ever going to happen cannot be changed anymore, every choice made by man isn't a choice but was already layed out for us 12 billion years ago at the creation of the universe, because of certain laws of physics information can never be lost, so it would be possible to read the past and pretell the future
And thus aquire all knowledge that's ever been and ever will be in one instant somewhere in the future
The reason why this last thing isn't possible (yet) is because we don't have the computerpower to calculate this huge formula (And we probably wont see the day that we have)
Who's with me?
EDIT: oops wrong section, well doesn't realy matter does it??