lein said he knew he hit someone. biker edwin mieses was left paralyzed. the fear in the suv was growing. >> we're on 178th! >> west 28th? >> help! 178th. >> reporter: ng testified that bikers couldn't pull her from the suv because she was wearing a seat belt. the 2-year-old was unhurt but covered in broken glass. for weeks, ng says, her daughter had nightmares. stephanie gosk, nbc news, new york. >>> still ahead here tonight, it's one of the most common questions of the doctor, and knowing the right answer could save your life. what if your family's history of cancer is hidden? you don't even know about it. we'll be back. >>> it's a question doctors always ask -- do you have a family history of cancer? you might say no. but what if there are cancer genes hidden in your dna? tonight, our national correspondent, kate snow, has the story of a woman who accidentally discovered her risk, raising a debate over whether more people should be tested even without a family history. >> reporter: robin carlin never thought she had to worry about her dna. >> i thought

lein said he knew he hit someone. biker edwin mieses was paralyzed. the fear in the suv was growing. >> we're on 178th! >> west 28th? >> help! 178th. >> reporter: ng testified thv because she was wearing a seat belt. the 2-year-old was unhurt but covered in broken glass. for weeks, ng says her daughter had nightmares. stephanie gosk, nbc news, new york. >>> still ahead tonight, it's one of the most common questions of the doctor and knowing the right answer could save your life. what if your family's history of cancer is hidden? you don't even know about it. you don't even know why are all these people so asleep yet i'm so awake? did you know your brain has two systems? one helps keep you awake- the other helps you sleep. science suggests when you have insomnia, the wake system in your brain may be too strong and your neurotransmitters remain too active as you try to sleep, which could be leading to your insomnia. ohh...maybe that's what's preventing me from getting the sleep i need! talk to your doctor about ways to manage your insomnia. introducing

[music] >> hi, my name is fred lein. i'm most proud of driving a ramp taxi since the beginning of the program in 1994. [music] >> fred, you are the absolute best! thank you fred for providing transportation for me and opening up my social life, and taking care of medical appointments, taking care of my mother [music] >> hi, my name is ann bailey and i've driven for luxor for almost five years now. i drove for desoto cab for 10 years prior to that. i drove in 1976 for the old, old yellow cab. this is frances mecchi and i've been driving her for about 11 or 12 years to her alzheimer's day program, which we call the memory club. every day when we drive through the presidio she'll say "oh goody, you're taking me through the enchanted forest." [music] >> my name amr a.mahmoud. i am like 49 years old. i have been driving cab more than 13 year in general. then i drove a ramp more than 3 years. this is my fourth now. i have been enjoying doing the job. i like every moment of it. >> thank you amr. [music} >> hi, my name is peter