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Hair Plays Important Role In Keeping Elephants Cool
2012-10-11 19:23:21

Our ancestors and other species were pretty hairy. They had to be. Body hair on mammals has long been thought of as an evolutionary requirement for survival in cold climes that prehistoric man and the woolly mammoth inhabited.


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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