The white boxes parked in California's almond orchards this time of year are easy to spot. Stacked in sets of four or six, they squat between dead-straight rows of trees awash in blossoms. (A walk through an almond orchard in early March is not unlike a stroll past a department-store perfume counter.) From afar, the boxes look as if they might provide a weary farmer a place to sit or store his tools. But get close enough under the right conditions--dry, above 55°, no more than a light breeze--and you can hear and see one of the most vital relationships in...
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