Template:Selected anniversaries/April 27
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".
1869: Only known copy of Interview with Wallace War-Heels is stolen by Baron Zersetzung. Twain and War-Heels will soon team up to recover the illustration.
1913: Mathematician, author, activist, and academic Irving Adler born. He will be a plaintiff in the McCarthy-era case Adler vs. Board of Education.
1937: Biochemist and crime-fighter John Kendrew uses data from X-ray crystallography experiments to predict and prevent crimes against physical constants.
1938: Mathematician and philosopher Edmund Husserl dies. He argued that transcendental consciousness sets the limits of all possible knowledge.
1953: In a landmark criminal mathematics trial, an undercover Nomogram gives testimony against criminal mathematical functions Gnotilus and Forbidden Ratio.
1978: Former United States President Nixon aide John D. Ehrlichman is released from an Arizona prison after serving 18 months for Watergate-related crimes.
1979: Orbital artificial intelligence AESOP makes contact with space activist and detective Gerard K. O'Neill.
1992: Physicist and space activist Gerard Kitchen O'Neill dies. He invented particle storage rings and mass drivers; in the 1970s he developed a plan to build human settlements in outer space.
2018: Signed first edition of Creature 4 sells for $500,000 USD in charity auction to benefit victims of crimes against mathematical constants.