mental health. did you knethat nearly 50% of americans, 50%, will suffer from some kind of mental illness in their lifetime? why is there such a stigma? is the conversation too tough to hear. you ll hear from doctors, you ll hear from celebrities. you will hear from families who are impacted each and every day by this. tweet me your questions at brooke b.cnn. we ll get to them in the next hour. don lemon reports on the new cases of violence leaving us asking, could they have been stopped? monday night, police and s.w.a.t. teams swarm a mall in new jersey. hundreds of frightened people hide while a gunman is on the loose. a scene all too familiar in this country. just change the details and locations, and it could be last week at los angeles airport or last july in aurora, colorado. or two years ago in arizona. gunmen either threatening to or