If you’re just tuning in, on Tuesday I offered five free signed copies of my new book Microcosm: E. coli and the New Science of Life to readers if they sent in a question. I was quite stoked to see the huge reaction. I can tell from the quality of the questions that the sheer volume was not just the result of the lust for a free book. While I can only answer five questions today, I think most people who asked one will find that parts of the book touch on it.

So–without further ado, let’s dive in. (This is the first of five posts I’ll deliver today.)

1. Frank asks:

This is one of the strangest parts of