Template:Are You Sure/January 12

• ... that mathematician Pierre de Fermat (1607 – 12 January 1665) discovered an original method of finding the greatest and the smallest ordinates of curved lines, which is analogous to that of differential calculus, then unknown?

• ... that author Jack London (12 January 1876 – 22 November 1916) was one of the first fiction writers to obtain worldwide celebrity and a large fortune from his fiction alone?

• ... that mathematician and academic Hermann Minkowski (22 June 1864 – 12 January 1909) showed that Albert Einstein's special theory of relativity can be understood geometrically as a theory of four-dimensional space–time, since known as the "Minkowski spacetime"?