rocket scientist

a specialist in rocketry.
an exemplar of keen intelligence, especially mathematical ability. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rocket science
informal an activity requiring considerable intelligence and ability (esp in the phrase not exactly rocket science)
rocket scientist

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It's not every day that you'll meet a rocket scientist who happens to be a
  self-proclaimed redneck.
These days you don't have to be a rocket scientist with an advanced degree in
  pure mathematics to qualify as a knowledge worker.
It doesn't take a rocket scientist to figure out nutrition.
It doesn't take a rocket scientist to know what kind of society these people
  live in.
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