For thousands of years, people have experimented with plants as a way to cure sickness, conquer infection, and increase longevity. Now, medical researchers are tapping into this vast treasure trove of folk knowledge in their quest for modern drugs to fight cancer and other menacing diseases. Venture to the US/Mexico border, where people have been using medicinal plants for thousands of years and continue today. It is a land of cacti, intense sun, and curanderos - those who heal with desert roots and herbs. Now, American scientists are tapping into that precious knowledge - from an innovative program at New Mexico State University to clinical tests at a cutting-edge Seattle research lab - student researchers are discovering the power nature's wonders, and perhaps the next breakthrough medicine.