With the renewed interest in nuclear weapons I have been struck by how few people there still are who have seen one explode. There are a few survivors of Hiroshima and Nagasaki and there are a small number who witnessed some of the above ground test explosions. But the last American above-ground test was in 1962 and the last above-ground test by any country was conducted by the Chinese in 1980. This means that the Indians, Pakistanis, Israelis--to say nothing of the Iranians and North Koreans--have never seen a nuclear explosion. In the main, this is a very good thing: the fallout from such a test is a real health hazard. But there is a downside. We have lost the experience of watching a nuclear explosion--perhaps the most powerful lesson about nuclear bombs there is.
1957 atomic test seen by the author. Credit: Department of Energy
An ultracold atomic gas can sync into a single quantum state. Researchers uncovered a speed limit for the process that has implications for quantum computing and the evolution of the early universe.
January 09, 2026 02:51 PM
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