Ones in oklahoma, particularly ones who have lost their kids, what is the best advice you've learned that you could offer. >> the most valuable thing thing you've learned, people you've lost, speak about them often, keep them in your heart. if you mention to me someone i lost on 9/11, i'm going to think of their face and it's going to make me smile. everyone will find happiness again, it's just not now. >> thank you for being with us. it's great to see you on the show. that's all for us tonight. anderson cooper will start in a few moments. more... step! [ mom ] my little girl...she loves to he...