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Air: The Restless Shaper of the World by William Bryant Logan is written with the passionate narrative style and wide-ranging erudition that makes William Bryant Logan's work a touchstone for nature lovers and environmentalists. Air is, like the contents of a bag of seaborne dust that Darwin collected aboard the Beagle, a treasure trove of discovery. Air sustains the living. Every creature breathes to live, exchanging and changing the atmosphere. Water and dust spin and rise, make clouds and fall again, fertilizing the dirt. Twenty thousand fungal spores and half a million bacteria travel in a square foot of summer air.