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2006-07-26 00:05:00

SYDNEY (Reuters) - A series of limestone caves west of Sydney, best known as a popular family tourist attraction, are in fact the world's oldest open caves, dating back 340 million years, Australian scientists say.


Word of the Day
dipsas
  • A serpent whose bite was fabled to produce intense thirst.
The word 'dipsas' comes from a Greek word meaning 'thirst'.