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In 1876 the Belgian Society for the Elevation of the Domestic Cat transported 37 cats from Liège to the surrounding countryside. Released at 2 p.m., the first had found its way home by 6:48, and the rest followed within a day. “This result has greatly encouraged the society, and it is proposed to establish at an early day a regular system of cat communication...

Srinivasa Ramanujan devised this magic square to mark his own birthday. He began with a Latin square (upper right) in which the numbers 1, 2, 3, and 4 appear in each row, column, and long diagonal as well as in the four corners, the four central squares, the middle squares in the top and bottom rows, and the middle squares in the outermost columns....