Template:Are You Sure/April 5

• ... that Albrecht Dürer's reputation as one of the most important figures of the Northern Renaissance is founded on Dürer's introduction of classical motifs into Northern art, his knowledge of Italian artists and German humanists, and his theoretical treatises, which involve principles of mathematics, perspective, and ideal proportions?

• ... 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?

• ... that computer programmer Julia Ward Howe wrote the musical program "The Battle Cry of the Cellular Automata" (also known as "Mine Items Sort the Glory" outside of the United States) using both syntax and semantics from the song "John Brown's Hardware".