I love hearing ‘origin’ stories about books, especially about beloved series in our house. Cressida Cowell opens How to Be a Viking with an explanation that the series was inspired by a drawing she did in her sketch book about a little Viking prone to seasickness and his relationship with his father, who happens to be chief of their tribe. Thus Hiccup and Stoik the Vast are born (and later spun into the How to Train Your Dragon series).