One idea to a sentence is still the best advice that anyone has ever given on writing. - Bill Bryson

Every human body consists of about 10 quadrillion cells, but about 100 quadrillion bacterial cells. They are, in short, a big part of us. From the bacteria’s point of view, of course, we are a rather small part of them.

Now here’s a thought to consider. Every twenty minutes on the Appalachian Trail, Katz and I walked farther than the average American does in a week. For 93 percent of all trips outside the home, for whatever distance or whatever purpose, Americans now get in a car. On average the total walking of an American these days—that’s walking of all types: from car to office, from office to car, around the supermarket and shopping malls—adds up to 1.4 miles a week, barely 350 yards a day. That’s ridiculous.

I clearly re-call standing on in downtown Melbourne, so freshly arrived that I still smelled of (possibly even glistened from) the insecticide with which the flight attendants sprayed the plane before arrival, watching the clanging trams and swirl of humanity, and thinking, “Good Lord, there's a country here.”