When Scilla broke the news to her mother the week before, she was in tears. “No one wants to come to my birthday party,” she sobbed. Her mother couldn’t believe that her friendly daughter already had to deal with such rejection at nearly nine years old. “What happened, honey?” “Everyone told their parents that Grandpa smoked in the house last year, and now none of their parents will let them come over anymore,” she said, crumpling into her moth...