Template:Selected anniversaries/April 27
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1791: Painter and inventor Samuel Morse born. He will co-invent the Morse code.
1837: Mathematician Paul Albert Gordan born. Gordon was known as "the king of invariant theory".
1913: Mathematician, author, activist, and academic Irving Adler born. He will be a plaintiff in the McCarthy-era case Adler vs. Board of Education.
1938: Mathematician and philosopher Edmund Husserl dies. He argued that transcendental consciousness sets the limits of all possible knowledge.
1978: Former United States President Nixon aide John D. Ehrlichman is released from an Arizona prison after serving 18 months for Watergate-related crimes.