Science: Dew Ponds

In southern England 3,000 years ago, voracious packs of wolves roamed the moist lowlands. The savage Britons of that Stone Age period, who had learned the art of domesticating animals, had to keep their cattle on the uplands lest they be devoured. On the uplands there were few streams of water. With the eerie ingenuity which savages sometimes manifest, the herders built "dew ponds" which stayed full of water though the animals drank from them every day. Some modern authorities contend that rain contributes practically all of the ponds' water supply, but...

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