Template:Selected anniversaries/April 15
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1452: Polymath Leonardo da Vinci born. His areas of interest will includ painting, sculpting, architecture, invention, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography.
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.
1854: Scientist and inventor Johann Philipp Reis uses scrying engine technology to fight crimes against mathematical constants.