One of the saddest things about teaching is telling my students to put their book away. I'll be in the middle of giving directions for lab or correcting yesterday's homework. I look up and realize that at least one student is diligently reading The Hunger Games, a graphic novel, Harry Potter, or some other book.
My response? "Student, I LOVE reading too. But now is not the time, so please put your book away."
I do this on a daily basis in several hours, and it is a chronic problem with a few students in particular. Our middle school does an amazing job of getting students interested in reading. All students have a book every day for independent reading, and the librarians take time to find an interesting book for the kids when they are done with their current read.
Still. It's time for science.