It is always quietly thrilling to find yourself looking at a world you know well but have never seen from such an angle before.

Every living thing is an elaboration of a single original plan. As humans we are mere increments - each of us a musty archive of adjustments, adaptations, modifications and providential tinkerings stretching back to 3,8 billion years. Remarkably we are even quite closely related to fruit and vegetables. About half the chemical functions that take place in a banana are fundamentally the same as the chemical functions that place in you. It cannot be said too often: all life is one. That is, and I suspect will ever prove to be, the most profound true statement there is.

I had to drive to Minneapolis once, and went on a back road just to see the country. But there was nothing to see. It's just flat and hot, and full of corn and soybeans and hogs. Every once in a while you come across a farm or some dead little town where the liveliest thing is the flies.

Everywhere throughout New England you find old, tumbledown field walls, often in the middle of the deepest, most settled- looking woods- a reminder of just how swiftly nature reclaims the land in America.

Consider the Lichen. Lichens are just about the hardiest visible organisms on Earth, but the least ambitious.

Open your refrigerator door, and you summon forth more light than the total amount enjoyed by most households in the 18th century. The world at night, for much of history, was a very dark place, indeed.

I come Des Moines. Somebody had to.