Template:Are You Sure/April 2

George Spencer-Brown's unorthodox and influential Laws of Form defines an elegant minimalist notation for the two-element Boolean algebra.

• ... that the accidental release of anthrax spores from a Soviet military research facility near the city of Sverdlovsk, Russia (now Yekaterinburg) on April 2, 1977, caused as many as a hundred deaths (although the exact number of victims remains unknown), and that the outbreak was concealed for years by Soviet authorities, who removed all medical records of the victims in order to hide serious violations of the Biological Weapons Convention?

• ... that mathematician and checkers player Marion Franklin Tinsley (February 3, 1927 – April 3, 1995) is considered to be the greatest checkers player who ever lived, and that Tinsley was "to checkers what Leonardo da Vinci was to science, what Michelangelo was to art and what Beethoven was to music"?

• ... that participants on the reality television program Can This Regex Be Saved? must prevent troubled regular expressions from committing crimes against mathematical constants?