Quantcast

Latest Ralph Quatrano Stories

532a3335b1492bc9bc8101341c93ae04
2010-02-04 14:36:12

Recent work at Washington University in St Louis sheds light on one of the most important events in earth-history, the conquest of land by plants 480 million years ago.


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'.
Related