Several man-made devices such as antique stone piles in Ukraine, medieval " dew ponds " in southern England or volcanic stone covers on the fields of Lanzarote have all been thought to be possible dew-catching devices.
12.
Several man-made devices such as antique, big stone piles in Ukraine, medieval " dew ponds " in southern England, or volcanic stone covers on the fields of Lanzarote have been thought to be dew-catching devices, but could be shown to work on other principles.
