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The Origins Of Whale Teeth
2013-02-20 10:30:22

April Flowers for redOrbit.com - Your Universe Online Although whales are mammals, they do not resemble any of the mammals surrounding us on land and have a unique evolutionary history. Whales have a triangular fluke for a tail, and they have no (visible) hind legs or body hair. One of the strangest differences between whales and their terrestrial cousins, however, is in the whale's mouth. Whale teeth are simpler and more "peg like" than those of other mammals. A new study...

2009-02-26 13:37:00

Same Study Uncovers How Each Tooth Signals the Next to Start Growing ROCHESTER, N.Y., Feb. 26 /PRNewswire-USNewswire/ -- A system of opposing genetic forces determines why mammals develop a single row of teeth, while sharks sport several, according to a study published today in the journal Science. When completely understood, the genetic program described in the study may help guide efforts to re-grow missing teeth and prevent cleft palate, one of the most common birth defects. Gene...


Word of the Day
sough
  • A murmuring sound; a rushing or whistling sound, like that of the wind; a deep sigh.
  • A gentle breeze; a waft; a breath.
  • Any rumor that engages general attention.
  • A cant or whining mode of speaking, especially in preaching or praying; the chant or recitative characteristic of the old Presbyterians in Scotland.
  • To make a rushing, whistling, or sighing sound; emit a hollow murmur; murmur or sigh like the wind.
  • To breathe in or as in sleep.
  • To utter in a whining or monotonous tone.
According to the OED, from the 16th century, this word is 'almost exclusively Scots and northern dialect until adopted in general literary use in the 19th.'
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