Guardian: A declassified and heavily redacted report from Britain’s defense ministry has raised concerns about the robustness of the pressurized water reactors in the Royal Navy’s fleet of 11 nuclear-powered submarines. The report notes that the reactors lack safety features that are now standard in civilian reactors. In particular, the reactors’ primary circuits, if compromised, could lead to the release of highly reactive fission products. The design flaw is troubling because the four nuclear submarines in the Vanguard class carry nuclear missiles.
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
Get PT in your inbox
PT The Week in Physics
A collection of PT's content from the previous week delivered every Monday.
One email per week
PT New Issue Alert
Be notified about the new issue with links to highlights and the full TOC.
One email per month
PT Webinars & White Papers
The latest webinars, white papers and other informational resources.