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2009-02-17 13:17:37

Researchers are studying data from the tree rings of conifers in Vietnam to reveal new clues into how droughts affected ancient civilizations.


Word of the Day
pawl
  • A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.
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