How does regular exercise to reduce the effects of mental stress

Mario was conducting research regarding the treatment of aids victims using stem cells. he found a source that was written recently and the author was known. unfortunately, he could not determine if it had been peer reviewed.

Why would one lymph node in the neck be swollen and not the other? what causes them to swell?

Lori didn't want to learn the piano and thought her mom was wasting money on lessons. lori didn't like practicing and saw no future purpose for learning the piano since she wasn't going to grow up to be a pianist. what is lori expressing?