What about the number of letters? As in, how many letters of recommendation does Mayo require?
This might seems like a strange question to me, but:
If I need three letters, and I'll have one from a professor I've had in about 4-5 classes (included a month abroad in a history/philosophy of science class), my research and academic advisor in the department, and one more... Problem is, I'm worred about the third person I'd ask: He is my supervisor for my computer help desk job I've been at now for three years and a full-time summer (and in another area near him another full-time summer), but I'm worred about his GRAMMAR, of all things. Would the admissions committee(s) frown upon letters from people who may have slight grammar issues? Or do they focus mainly or solely on the content of the letters?
Other than him, I don't have anyone that I would feel ABSOLUTELY comfortable asking, or someone I know and with whom I've worked for a while...