Square Root Day September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets. Gordon's daughter set up a Facebook group where people can share how they were celebrating the day. One suggested way of celebrating the holiday is by eating square radishes, or other root vegetables cut into shapes with square cross sections (thus creating a "square root"). Square Root Day occurs on the following dates each century: The number of years between consecutive Square Root Days in a century are consecutive odd numbers: 3, 5, 7, 9, 11, 13, 15, 17. This illustrates the fact that
Penrose square root law Penrose square root law In the mathematical theory of games, the Penrose square root law, originally formulated by Lionel Penrose, concerns the distribution of the voting power in a voting body consisting of "N" members. It states that the "a priori" voting power of any voter, measured by the Penrose–Banzhaf index formula_1 scales like formula_2. This result was used to design the Penrose method of for allocating the voting weights of representatives in a decision-making bodies proportional to the square root of the population represented. To estimate the voting index of any player one needs to estimate the number of