every time I look in a pond and the water's all murky, my mind echoes the phonetically pleasant word "turbidity" nonstop until I have left the vicinity of the pond. the likelihood of anyone leaving the pond without me mentioning spectrophotometry decreases exponentially with each passing second that I am exposed to the pond. "there's microbes in there," I'll say. you already know this. "turbidity," I'll add. you're nodding patiently.