Template:Selected anniversaries/June 13
1555: Mathematician, cartographer, and astronomer Giovanni Antonio Magini born. He will support a geocentric system of the world, in preference to Copernicus's heliocentric system.
1629: Mathematician Pierre de Fermat uses scrying engine techniques to download award-winning children's book The Unruly Submarine.
1831: Physicist and mathematician James Clerk Maxwell born. His discoveries will help usher in the era of modern physics, laying the foundation for such fields as special relativity and quantum mechanics.
1946: Celebrated children's book The Unruly Submarine wins Caldecott Medal.
1947: Writer and philosopher Culvert Origenes publishes critical review of The Unruly Submarine, calls the award-winning children's book "a prelude to McCarthyism."