How do the requirements of a unanimous verdict and proof beyond a reasonable doubt relate to the personal concerns that some jurors will bring to the jury room?

On a personal level, jurors are often more concerned with a quick result and getting home to their families. Rather than be the one person to hold up the verdict, they'd rather vote with the rest of the group and be done with it. People also feel uncomfortable with the hows and whys; they might be incapable of verbalizing concerns and questioning evidence. Thus, they say nothing. On the other hand, strong personalties and idealism will lead some to stand behind their beliefs. If their feelings are well stated and conveyed properly, they have the power to sway others.