Thanks for all the good discussion, this actually makes sense, of course, now that I think about it, I am sure they are crashing millions of particles together

Thanks for all the good discussion, this actually makes sense, of course, now that I think about it, I am sure they are crashing millions of particles together and doing some analytics, so based on that we know about what the size is. Sort of like how when we do analytics online we know the approximate height of say all Amazon customers who purchased jeans. OK dumb analogy but it works for me :)