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• r  to an unimaginable extent

• Splitting a star in two would require an impact from without or an explosion from within of a force unthinkably great.
• In this world, there may be no need for the physical augmentation of the human brain, as the most significant, and quite unthinkably powerful, augmentation will have taken place .
• Over the last four years, hundreds of wives and parents have received unthinkably bad news from some 8,000 miles away.

• unimaginably

News & Articles

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• Scorching Southwest heat wave could challenge all-time records
  Unthinkably high temperatures, even in one of the world's hottest zones - the desert Southwest, are forecast Friday into early next week.
  June 27, 2013 - Washington Post

Quotes

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• Rachel Carson in South Coast Today
  Without our ocean,writes Carson, "our world would be visited by unthinkably harsh extremes of temperature."