Template:Are You Sure/April 5

Combat surgeon and alleged time-traveller Asclepius Myrmidon publishes On Halting Problems, his monumental study of pathological medical algorithms.

• ... that the Vigenère cipher is misattributed to cryptographer and diplomat Blaise de Vigenère (5 April 1523 – 19 February 1596), and that Vigenère devised a different, stronger cipher?

• ... that surgeon and scientist Joseph Lister (5 April 1827 – 10 February 1912) pioneered antiseptic surgery, performing the first antiseptic surgery in 1865?

• ... that writer and crime-fighter Isaac Asimov (2 January 1920 – 6 April 1992) wrote Two Plus Two Opens the Door after Alice Beta famously challenged Asimov to "explain Gnomon algorithm functions to a five year old"; that Two Plus Two Opens the Door influenced a generation of young crime-fighting mathematicians; and that after Asimov's death in 1992, Beta published a revised edition as a tribute to Asimov?

• ... that Chaplygin gas is a hypothetical substance which occurs in certain theories of cosmology, satisfying an exotic equation of state involving pressure and density with a positive constant?