Nature: In 1992, three years after the fall of the Berlin Wall, a spy walked into the US embassy in Warsaw and offered to sell the CIA the real and code names of all intelligence agents from the HVA ( Hauptverwaltung Aufklärung)—the foreign department of the Stasi, the East German Ministry for State Security. The CIA bought the highly sensitive information for a mere US$75,000.The spoils—released to the Berlin Stasi archive and made available to history professor Kristie Macrakis at the Georgia Institute of Technology in Atlanta in 2005—have the potential to alter popular perceptions of the activities of the East German intelligence agency and secret police.Macrakis’s analysis of the CIA material reveals that about 40% of all HVA sources planted in West German companies, research institutions, and universities were stealing scientific and technical secrets.
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.