On Monday, Pearl brushed her teeth with salmon-flavored toothpaste and got dressed for school.  When she climbed on the bus—moldy windows and torn seats—her best friend Poppy, who everyone called Seed, smiled and said, “Mmmmmm, salmon.” “What did you use?” Pearl asked. “Chicken, like always.”  Seed sighed.  “Mom won’t let me try salmon until all…