Bikini Island, in the central Pacific, was the site of 23 nuclear bomb tests in the middle of the last century. Unsurprisingly, the place is radioactive, and a study has found radiation levels far exceed expectations. However, Central Park is more radioactive than some of the islands near Bikini that were affected by the fallout from the tests. Scientists from Columbia University measured gamma radiation at six islands in the Marshall Islands, including Bikini. It has now been 58 years since the last atomic bomb was tested there. Radiation was anticipated to come primarily from Cesium-137 produced in the bombs, which has a half-life of thirty years, so it should now be a quarter of what it was when testing stopped. In Proceedings of the National Academy of Sciences, the authors confirm that 90 percent of the radiation at Bikini comes from the decay of Cesium-137 to Barium-173, identifiable by the release of a 0.662 mega electron volt gamma ray. With radiation dominated by a single