THE ART OF EVASION - A DEBATE PRIMER: Independent voters will ask Barack Obama and John McCain dozens of direct questions at tonight's debate. And if history is any guide, they'll spend much of their time reframing issues and evading direct answers to 'stay on message.' Join Kojo to explore discrepancies between questions asked and answers provided -- —d what cutting-edge researchers are learning about the political brain. (23 min.) THE INCREASING POPULARITY OF SALVIA: Salvia is an herb related to the mint family. But when processed, Salvia can also be a powerful hallucinogenic drug. Though legal in most of the US, it has been banned in 13 states including Virginia. With approximately 750,000 people reportedly having tried it in just the last year, we examine what's known about Salvia in the medical and scientific communities, and explore how it should be treated. (26 min.)