I recently wound up in the emergency room. Don’t worry, it was probably nothing. But to treat my case of probably nothing, the doctor gave me a prescription for a week’s worth of antibiotics, along with the usual stern warning about the importance of completing the full course.
I understood why I needed to complete the full course, of course. What I didn’t understand was why a full course took precisely seven days. Why not six, eight or nine and a half? Did the number seven correspond to some biological fact about the human digestive tract or the life cycle of bacteria?
My doctor had recommended seven. Where in the world had seven come from?
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