The U.S. explodes a hydrogen bomb over the Bikini Atoll. Typically, they didn’t really know what they were doing. The 1954 explosion, the most powerful manmade blast in history, is hundreds of times greater than expected. Clouds of radioactive coral dust fall on a Japanese fishing boat and several small islands of Micronesia. Thyroid cancer and leukemia plague those exposed to the radiation. Nice work, fellas.