i'm siena. let's start with our top story for this week. imagine a classroom without basic supplies to read and write. unfortunately, there are many schools like that in poor countries around the world. you're about to meet an organization working to change that. >> these students in sri lanka are on their way to a special library. what makes it special would be surprising to us -- it has books! >> room to read is an organization that is opening schools and libraries across the developing world for the poorest of the poor -- hundreds of schools, thousands of libraries so that every child everywhere is no longer denied an education because they were born in the wrong place at the wrong time. >> john wood is an amazing guy. he used to be a big executive at microsoft until he went on vacation in nepal. that's when he saw the desperate need for books and libraries. he changed the course of his own life to change the lives of children all over the world. >> when i was growing up in pennsylvania, we had actually a bookmobile that came to our town

i'm siena. let's start with our top story for this week. doing tobacco is really bad for you. in fact, students in arizona just won't stand for it. scott explains. >> teens from the group known as stand against tobacco journeyed to phoenix, the state capital, to give the government a piece of their mind. >> stand means... >> stand means... >> ...students... ...students... ...students... >> ...taking a new... >> ...taking a new... ...taking a new...... >> taking a new direction. >> together: stand! whoo! >> they came together for national kick butts day, a day to raise awareness about the negative effects tobacco has on the teenage body. students showed paintings, made posters, and did all kinds of community-service projects. >> it's a tar jar. it's basically a year's worth of tar from one pack a day of smoking cigarettes. this is how much tar will be in your lung. >> the plastic box is a bunch of cigarette butts, and what we're showing is that cigarette butts are a huge problem, especially in parks. they're -- they're extremely bad for the environment, and people litter them a