If I swallow a watermelon seed, will one start growing in my stomach?

Why do older people lose their teeth? Does gum really take seven years to digest? Why can I curl my tongue? We at World Book answer all of your human bodyrelated questions-and not only questions about your mouth area. Answer Me This, World Book answers questions about such topics as technology, outer space, and animals, too. We help you make sense of the world with informative and funny answers. Well . . . at least we think they are funny.