Random Question

How quickly can you find out what is unusual about this paragraph? It looks so ordinary that you would think nothing was wrong with it at all; and in fact, nothing is. But it is unusual. Why? If you study it and think about it you may find out, but I am not going to assist you in any way. You must do it without coaching. No doubt if you work at it for long, it will dawn on you. I don't know. Now, go to work and try your luck.