From middle-grade darling Anna Staniszewski comes the story of a girl who might just have friendship down to a science. Friendship? Just add science . . . LB messed up. Even though her best friend, Kat, says she's forgiven her for that whole using-science-to-make-herself-popular thing, things are still pretty weird between them. Then the bully from their old school, Courtenay, shows up -- pretending to be nice Worst of all,...