“Stick out your arms," he'd say, "straight out at your sides," and when he had you in the appropriate cruciform position he'd say, "Left index finger to right index finger straight across your heart, that's the history of the Earth. You know what human history is? Human history is the nail on your right-hand index finger. Not even the whole nail. Just that little white part. The part you clip off when it gets too long. That's the discovery of fire and the invention of writing and Galileo and Newton and the moon landing and 9/11 and last week and this morning. Compared to evolution we're newborns. Compared to geology, we barely exist”