. >> reporter: new york times columnist nick kristoh and his wife, sheryl wudunn. challenge. if we want a full life, we must give back. a lot of people feel, there's not much i can do. >> any one individual can't solve a problem in its entirety. one individual can have a transformative impact. >> reporter: for 50 cents, you can deworm a child, preventing a lifetime of health problems. for $50, you can buy 20 books for a child. you're just saying just do a little bit more? >> absolutely. we really do think if you fold into your life, it becomes a part of your life. >> reporter: make giving a habit, they say. because we now know that it not only helps others, but it also helps you. dan harris, abc news, new york. >> simple. >> and one important point they make. it's not just writing a check. getting out there, volunteering, meeting the people you're helping is better for you. >> and it's help to find a cause you believe in. not just doing it for the sake of doing what everybody else is doing. so simple. >> that's what's making new this is morning. . >> good morning w