I often think of these interdependent systems in the context of my own healthcare. Not long ago, I was walking in the backyard, staring up at the night sky, when I happened to step on a nail that went right through my shoe and an inch into my foot. The next morning, I drove on a good road to a clinic a few minutes from my house, where I received a booster shot to eliminate the already small chance that my mishap with the nail might result in tetanus. But in order for this minor medical intervention to occur, so many systems had to work in my favor: I needed healthcare access, of course—in my
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