The Question and Answer section for A Wrinkle in Time is a great resource to ask questions, find answers, and discuss the novel.
The Black Thing, at least on Earth, uses negative human traits like greed, hate, malice....to fight its battles.
Meg is portrayed as an awkward girl who doesn't do particularly well in school nor fit in with the popular crowd. However, this apparent mediocrity conceals her extraordinary math abilities - a subject her father taught her before he disappeared....
Meg realizes Charles wallace is not himself when he begins to act cruel, and takes a sudden interest in pineapple, which he had hated before.