From the clayey soil of northern Wyoming is mined bentonite, which is used as filler in candy, gum, and lipstick. We Americans are great on fillers, as if what we have, what we are, is not enough. We have a cultural tendency toward denial, but being affluent, we strangle ourselves with what we can buy. We gave only to look at the houses we build to see how we build *against* space, the way we drink against pain and loneliness. We fill up space as if it were a pie shell, with things whose opacity further obstructs our ability to see what is already there.

The retreat and disappearance of glaciers—there are only 160,000 left—means we're burning libraries and damaging the planet, possibly beyond repair. Bit by bit, glacier by glacier, rib by rib, we're living the Fall.

History is not truth versus falsehoods, but a mixture of both, a mélange of tendencies, reactions, dreams, errors, and power plays. What's important is what we make of it; its moral use. By writing history, we can widen readers' thinking and deepen their sympathies in every direction. Perhaps history should show us not how to control the world, but how to enlarge, deepen, and discipline ourselves.

Everything in nature invites us constantly to be what we are.

Turbulence, like many forms of trouble, cannot always be seen. We bounce so hard my arms sail helplessly above my head. In evolution, wing bones became arms and hands; perhaps I'm de-evolving.

Walking is also an ambulation of mind.

To trace the history of a river . . . is to trace the history of the soul, the history of the mind descending and arising in the body.