the first thing you do is demand your freedom. Let those who believe in vaccination bang their heads against the wall, while those who know better can at least protect their own kids. Darwinian selection, natural or not, amounts to the same result. ...
In fact, people think of things because of the words in their head. And since these same words exist simultaneously in other people's heads, it's very difficult to think of wholly new and unique things, and most new and surprising ideas always exist in some form or other in many heads...