"On the Human Factor, we profile survivors who have overcome the odds. Confronting a life obstacle - injury, illness or other hardship - they tapped their inner strength and found resilience they didn't know they possessed. This week, Grammy award- winning singer Tionne "T-boz" Watkins, lead singer of the best-selling female hip/hop group TLC, shares her story about her struggles with sickle-cell anemia and a brain tumor." - CNN