tonight a conversation whicith sheryl wudunn along with her husband. she is the author of a book about the plight of women all over the world called "half the sky." we are glad you have joined us. a conversation about "half the sky" with sheryl wudunn coming up. >> every community has a martin luther king boulevard. it's the cornerstone we all know. it's not just a street or boulevard, but a place where walmart stands together with your community to make every day better. >> and by contributions to your pbs station from viewers like you. thank you. tavis: sheryl wudunn is a best- selling author who became the first nation american norman twin region -- woman to win the pulitzer prize. an exhibition based on her book is showing in l.a. is through may 20 with a two-part pbs special coming in october. >> the challenge women and girls face around the world is not an easy topic to talk about, but we think it is the moral challenge. >> you rescue girls from brothels. how does that work? >> we have the same life. >> to get someone to say this is wrong, it tak