let me give you some advice, friend.
look up boy scouts, then go to the news section.
then reconsider your summer pasttime.
One purpose may be to check for cancer. If abnormal cells are found, there might be something wrong...
Left ventricle is the answer.
I would say feelings of worthlessness. You can't really see it on their body, but they can tell you if they choose to, so that makes it hidden in my opinion.
I hope that helps!
