Nothing - really, absolutely nothing - says more about Victorian Britain and its capacity for brilliance than that the century's most daring and icon… - Bill Bryson

Consider the fact that for 3.8 billion years, a period of time older than the Earth's mountains and rivers and oceans, every one of your forebears on both sides has been attractive enough to find a mate, healthy enough to reproduce, and sufficiently blessed by fate and circumstances to live long enough to do so. Not one of your pertinent ancestors was squashed, devoured, drowned, starved, stranded, stuck fast, untimely wounded, or otherwise deflected from its life's quest of delivering a tiny charge of genetic material to the right partner at the right moment in order to perpetuate the only possible sequence of hereditary combinations that could result — eventually, astoundingly, and all too briefly — in you.

The makers of sneakers also thoughtfully pocked the soles with numberless crevices, craters, chevrons, mazes, crop circles, and other rubbery hieroglyphs, so that when you stepped in a moist pile of dog shit, as you most assuredly did within three bounds of leaving the house, they provided additional absorbing hours of pastime while you cleaned them out with a stick, gagging quietly but oddly content.

As Edward P. Tryon of Columbia University once put it: "In answer to the question of why it happened, I offer the modest proposal that our universe is simply one of those things that happen from time to time." To which adds Guth: "Although the creation of a universe might be very unlikely, Tryon emphasized that no one had counted the failed attempts."