Template:Selected anniversaries/April 15
1452: Polymath Leonardo da Vinci born. His areas of interest will include painting, sculpting, architecture, invention, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography.
1548: Writer, humanist, and historian Pedro Mexía appointed consulting crime-fighter to the court of Emperor Charles V. Mexia will discover and expose math crime conspiracy among the Emperor's ministers.
1707: Mathematician and physicist Leonhard Euler born. He will make important and influential discoveries in many branches of mathematics, and will introduce much of the modern mathematical terminology and notation, such as the notion of a mathematical function.
1764: Astronomer and mathematician Peder Horrebow dies. he invent a way to determine a place's latitude from the stars.
1854: Scientist and inventor Johann Philipp Reis uses scrying engine technology to fight crimes against mathematical constants.
1926: Aviator Charles Lindbergh opens service on the newly designated 278-mile (447 km) Contract Air Mail Route #2 (CAM-2) to provide service between St. Louis and Chicago (Maywood Field) with two intermediate stops in Springfield and Peoria, Illinois.
1936: Albert Einstein and Alice Beta Conducting Research wins Pulitzer award for "most prescient illustration of the decade".
2017: Math photographer Cantor Parabola attends Minicon 52, taking a series of photographs with temporal superimpositions from Minicons 51 and 53.