my name is kathy broussard. i started the houston ground angels and we provide free air transportation and free ground transportation for medical patients coming in and out of the houston area. there's probably 300 people volunteering their car, their gas, time. >> when i see them, they give me hope. they'll tell me, stay there with us, fighting. >> god has bypassed me in cancer. and if i could help somebody -- and i'm sorry for crying, but if i can help somebody make their life a little better, then that's what it's all about. it's not about me. >> kathy and her volunteers have completed about 6,000 air and ground missions since 2001. to nominate someone you think is changing the world, go to cnn.com/heroes. we'll be back with our remaining moments after this. right now, there's a nurse saving a life in baltimore.