What is the real scoop on letters? Is it neutral or not useful to have a letter from a professor you took a class with? Does a lab class weigh more than a lecture class? Is it not useful to have a letter from research that wasn't completely physics? Does it matter if letters come from a physics research supervisor at school or on an outside lab? Does having more than 3 really make a difference? So many questions, so little time. Actually no time, since all the deadlines have passed except if you fund yourself. I was just wondering what people thought.
The only real thing I heard about letters was that if they heard of the letter writer then it helps.
I just imagine they sit by an open window and throw out the window all the irrelevant things from your application folder.
Or they throw all the applications up in the air and whichever land on top are the ones that get in.