Frail and elderly, they speak at L.A.'s Museum of Tolerance. 'It's so critical to tell our story,' says one of them, an 81-year-old woman.

Every Tuesday at 2 p.m., Bella Friedman steps onto the dais at the Museum of Tolerance, sits down on the straight-backed chair, folds her hands in her lap and looks out at the audience that has gathered to hear about life, death and the Holocaust.

She is 82, neatly coiffed, with tailored pantsuits that hide the tattoo on her left forearm. She is the only member of her immediate family to survive. She brings pictures of the people she lost. Her mission: to make sure the world does not forget.