By Susan Tweit
My Mom, Joan Cannon Tweit, the California girl who grew up hiking and camping with her father, who had such perfect pitch that her high school choir director used her voice instead of a tuning fork to start concerts, who met my Dad in college at Berkeley and was married to him for almost 59 years, who earned a master’s degree in library science and worked as a school librarian despite being legally blind, who fought all forms of injustice, who prized birdsong, wildflowers and mountains almost as much as chocolate, and who passed her passions to my brother and me, died at dawn on a recent Thursday.