Arrange the sentences P, Q, R, S and T in the correct order to form a meaningful paragraph.

P: Every time we stumble while speaking, we have found one such gap.
Q: One reason is that preparing to teach forces us to arrange ideas in a clear order.
R: Another is that explaining aloud exposes gaps in our understanding that silent reading hides.
S: Many students find that they understand a topic best when they have to teach it to someone else.
T: So the next time you revise a chapter, try explaining it aloud, even to an empty room.