This is without doubt the most wonderful moment of my research," marveled retired engineer Pat Delgado last week, as he stood in a wheat field near Sevenoaks, in the British county of Kent. "No human could have done this."
Delgado was gazing at a large area where the crops had been mysteriously flattened in a remarkable pattern. A large, nearly perfect circle of plants had been bent down in a clockwise direction. Extending from the circle were other shapes: antennae, a ladder-like strip and a semicircle.
The Sevenoaks phenomenon is the latest of hundreds of circular patterns that have appeared in...
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