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Latest Timothy J. Bralower Stories

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2010-03-01 13:02:12

An asteroid strike may not only account for the demise of ocean and land life 65 million years ago, but the fireball's path and the resulting dust, darkness and toxic metal contamination may explain the geographic unevenness of extinctions and recovery, according to Penn State geoscientists. "Our results shed light on the causes of nannoplankton extinction, how productivity was restored, the factors that controlled the origination of new species, and, ultimately, how phytoplankton influenced...


Word of the Day
tessitura
  • The prevailing range of a vocal or instrumental part, within which most of the tones lie.
This word is Italian in origin and comes from the Latin 'textura,' web, structure.