Recently my daughter asked for a book from which she could study sign language. Does she have a friend who is hard of hearing? No. Well, not a friend she's ever met, anyway. No, she wants to learn sign language out of loyalty to Cece Bell, because she adores El Deafo that much. She's been scheduling weekly sessions (my daughter, not Cece Bell) in which she works with my husband and I on our lip-reading and sign language. After trying to learn sign language from El Deafo itself, she realized that she needed a better resource.
I bought her Signing for Kids, Expanded Edition. Because we all know that I'm a sucker for any request for a book. In truth, her interest had already faded by the time the book arrived. But I think it quite likely that she'll want it someday. [This is why I have such a ridiculously large number of books in my house. Because we might need them. Someday.]
You couldn't make this stuff up. We also made blackberry fool after reading A Fine Dessert awhile back, so I suppose this isn't our first experience with this dynamic. But it is the first one for which a reference book was required.
Have your kids had real-world interests sparked by books?