`  == ``The rock thrown towards a tree``? What is the source for this?? ==  I've never heard of this paradox before.  What is the source for it?   I'm very familar with Aristotle's Physics and I don't find it there.  Nor do I find it in Simplicius's commentary. I'd like to replace it with the ``Dichotomy`` paradox given by Aristotle.  Any objections?`