Ascenders, Descenders, & ALL CAPS (Score 2, Interesting)

As a graphic design student, I have been taught that it is more difficult to read blocks of text that have been made in ALL CAPITAL LETTERS. The reason for this is that the ascenders (pieces going up from the main body of the word, like the top of the "d" in "word") and descenders (like "y" in "you") help us to see the word at a glance. In effect, once we have gotten used to reading the english language, we no longer read letters at all, but words as whole characters. Even when the middle letters are scrambled, the letters have almost the same shape. I would like to see someone try this little experiment with capital letters, as I doubt it would work nearly as well.