frustration

In person In person In person.
I had a friend recently lose a lot of weight. A lot. She says people see what they like in you. They'll see themselves, etc etc. Sunset. She says they won't see you, in other words.
Did she become so callous to her own feelings and what it's like to be her that she causes herself to vomit when she's alone?

How do I go about making people Shut the hell up when the professor is lecturing. I don't want to be a bitch but what should I do?

I am NOT in the mood to put up with the constant talkers for any more class periods. This happens not only in my Sociology course, but I can not believe people also have the nerve to hold side conversations during CHEMISTRY.