Nature: Nuclear reactors around the world produce highly enriched uranium for civilian research. Compared with the HEU in nuclear arsenals, the total amount of civilian HEU is modest (about 100 tons), yet not so modest that its proliferation implications can be discounted. Pablo Adelfang, the head of reactor research at the International Atomic Energy Agency, discussed the danger recently with Nature‘s Declan Butler.
The finding that the Saturnian moon may host layers of icy slush instead of a global ocean could change how planetary scientists think about other icy moons as well.
Modeling the shapes of tree branches, neurons, and blood vessels is a thorny problem, but researchers have just discovered that much of the math has already been done.
January 29, 2026 12:52 PM
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