The Day of Two Suns: 70 years ago, the Pentagon conducted its biggest-ever atmospheric H-bomb test at Bikini Atoll, in the Marshall Islands, in the central Pacific. The 15-megaton Bravo shot spewed radioactive fallout on thousands of Marshallese, and long-lived radioisotopes all around the planet. Nearby Rongelap Atoll suffered the worst. Seventy years later, the people of Rongelap and Bikini have yet to go home.