Perfect! My four-year-old has begun to ask me sometimes at bedtime why people have to die. Now instead of merely saying prayers with him, I can tell him, y'know, your cells count down their telomeres because otherwise cancer would be even more inevitable than it already is. Thanks, popular expositors of science, Mitchell Moffit and Gregory Brown! At least I learned something. Psst, you researchers over there, you're gathering your material for another chapter in this story, right?? P.S. I only have to ask Wikipedia "Telomere" (which refers to "Hayflick limit") to get my answer: Yes, and there have been revisions to this chapter too.