If you've ever lived in a dense city with a busy subway like New York, Washington or San Francisco (or all three like I have) you probably know enough to be scared of the creatures that inhabit the rumbling underground world. I'm not talking about the smelly guy who stands just a little too close or the chatty woman who can't seem to stop herself from reading your private emails on your phone, but the microscopic lifeforms on every turnstile, handhold and window. Is this fear legitimate or misplaced?
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