What is a hung jury?

(1)  A hung jury is one where the jurors have not come to
a unanimous or clear decision. In the Tom Robinson jury's case, the vote would have to
be unanimous. At least one juror voted for acquittal (at least on the initial
vote).

(2)  Specifically, the Maycomb jury does not allow
women or African-Americans.

(3)  At first, Scout believes
Alexandra and Atticus are discussing the possibility of sending her away. But, after
listening further, she discovers that they are talking about
Calpurnia.

(4)  Atticus says he is not too afraid, but "too
old." He means this at least half-jokingly.