Things That Wear Me Out

In ascending order, here are the work-related things that have worn me out recently:

Sort of tiring, but exhilarating:

Spending the entire day in the operating room.

Sometimes difficult, but not too bad:

Spending two hours making patient-related phone calls.

Truly tiring:

Spending all day in clinic.

Tiring and also painful:

Spending two hours dictating the charts of the day in clinic.

Absolutely exhausting:

Spending all day teaching six periods of high school health class on the dangers of smoking.

I really respect teachers. How do they do it?