> Why? It could be that the scientists are simply smarter; most physicists could, if necessary, make it through a PhD program in French literature, but few prof

> Why? It could be that the scientists are simply smarter; most physicists could, if necessary, make it through a PhD program in French literature, but few professors of French literature could make it through a PhD program in physics. This sentence usually ruffles some feathers, and is a good, even if weak, example of things you "can't say".