<p>LOS ANGELES — She's publishing a series of kiddie storybooks.</p>
<p>She's working with scientists who have discovered how to neutralize radiation.</p>
<p>She's plotting to make a documentary about Kabbalah, a religious philosophy based on Jewish mysticism.</p>
<p>Who's that girl?</p>
<p>These days, Madonna strives to be neither material nor immaterial. After straddling the heights of wealth and celebrity for two decades, the pop diva is on a quest for meaning. And in American Life, due Tuesday, that means questioning the impulses behind her own rise to riches.</p>