One of the most iconic photographs of all time is Dorothea Lange’s "Migrant Mother," the portrait of a dignified woman with her hungry children that has come to be the visual symbol of the great depression. Now, in a new book written by Lange’s goddaughter (Grab a Hunk of Lighting by Elizabeth Partridge), along with the story of the photographer’s life is the interesting anecdote about how this iconic photograph came to be—and how it almost wasn’t. Lange had been struggling with her subjects in the migrant camps, and was on her way home after a dismal month on the road when a hand-lettered sign alerted her to one more opportunity to photograph in a camp of pea pickers, one more chance to make a photograph. In just a few minutes, she made history. Read the story and link to the book at the Brain Pickings blog.