Template:Are You Sure/January 15

• ... that Johannes Schöner was a pioneer in the history of globe making, and that he played a significant role in the events leading up to the publication of Copernicus' De revolutionibus in 1543?

• ... that a Kovalevskaya top is a symmetric top in which two moments of inertia are equal, the third is half as large, and the center of gravity is located in the plane perpendicular to the symmetry axis (parallel to the plane of the two equal points)?

• ... that the Superimposed Fraunhofer is a German postage stamp misprint in which the image of Joseph von Fraunhofer appears superimposed on the color spectrum bar, and that the cause of the misprint is thought to originate in as as-yet unidentified crime against light?

• ... that although greedy coloring algorithms do not, in general, use the minimum number of colors possible, they have been used to prove other results about colorings?