New York Times: According to a recent report by the US–Korea Institute at the Johns Hopkins University’s School of Advanced International Studies, North Korea may have restarted one of its nuclear reactors in order to produce weapons-grade plutonium. Satellite images show steam rising from the Yongbyon nuclear facility, an indication that it is once more up and running. Despite having agreed in 2007 to shut it down, North Korea has since rebuilt parts of the reactor that had been dismantled, evicted inspectors, and conducted several nuclear tests. And earlier this year, it announced it was reopening the plant, ostensibly to generate electricity. US officials are being cautious in their assessment of the current situation because of North Korea’s history of making, then breaking, promises to disarm in order to gain concessions in the form of economic aid and fuel.
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.