- In mathematics, the von Neumann paradox, named after John von Neumann, is the idea that one can break a planar figure such as the unit square into sets of points and subject each set to an area-preserving affine transformation such that the result is two planar figures of the same size as the original. This was proved in 1929 by John von Neumann, assuming the axiom of choice. It is based on the earlier Banach–Tarski paradox, which is in turn based on the Hausdorff paradox.
- The months of April and May, 1853, passed rapidly, and are full of pleasant memories of hunting, riding, fishing, and making friends. I was able to save a little money out of my pay, as eatables were more abundant and cheaper than in Vancouver8, where the mess bill consumed nearly my entire pay. There was a fine post garden, from which we had a large supply of rejected potatoes that we fell heir to, from the artillery. They were too small for our use, but the Indians were fond of them, and brought us all the clams, fish and game we wanted in exchange for the little tubers.