>>5931721I had an interesting talk about this with a physicist buddy of mine (his IQ is really high so most people probably won't understand this post)
It was a while back so my terminology and understanding of the discussion might be a little off.
Anyway, if you take the same biological organism and put it through the same events, you would expect it to make the same choices every time. But apparently, on account of some kind of quantum bullshit at some minuscule level electrons or something like that have a sort of randomness to them in that as far as we can tell, they don't do the exact same thing every time. Depending on how you interpret it, this could be said to be the mechanism for free will, since this has an impact on the electrical signals sent through the synapses of your brain, which means that the exact same organism put through the exact same series of events wouldn't actually make the exact same choices every time.