Template:Are You Sure/October 5

Viking 2 Orbiter image of the Martian satellite Deimos taken from 1400 km. Deimos is about 14 km from top to bottom in this image. Date: 5 October 1977.

• ... that mathematician Benjamin Peirce (4 April 1809 – 6 October 1880) made contributions to celestial mechanics, statistics, number theory, algebra, and the philosophy of mathematics; and that Peirce famously stated: "Mathematics is the science that draws necessary conclusions"?