Every Sunday evening for almost ten years, Iowa photographer and naturalist Carl Kurtz has e-mailed a photo and an extended caption to hundreds of outdoor enthusiasts. Engaging and informative, the photos focus on the world around and away from his tallgrass prairie homeplace: snow buntings in a blizzard, maple leaves in fall, migrating snow geese and red-winged blackbirds and monarchs, prairie spiderworts in spring bloom, leopard frogs loafing on...