What does Scout overhear before she goes to bed that night? Explain what Atticus means when he says, “The jury couldn’t possibly be expected to take Tom Robinson’s word against the Ewell’s…”

Scout overhears Uncle Jack and Atticus talking. Uncle Jack explains that he doesn't want to have children because he doesn't understand them well enough. Atticus muses that Scout needs to learn to keep her temper under control because in the next few months, there is going to be a lot in store for the family. Jack asks how bad it will be, and Atticus says that it couldn't be worse - the case comes down to a black man's word against the word of the white Ewell family, and the jury couldn't possibly take Tom's word over the word of white people. Atticus just hopes that he can get his children through the ordeal without having them catch "Maycomb's usual disease," when "people go stark raving mad when anything involving a Negro comes up." Atticus hopes that Jem and Scout will look to him for their answers rather than to the townspeople.