Guardian: Depleted uranium (DU) is attractive for use in bullets and shells because its density, at 19 g/cm 3, is so high. Despite its name, DU retains some radioactivity and is chemically toxic—which makes its use in munitions controversial. Nick Harvey, the number-two official at Britain’s Ministry of Defense, has now admitted that he misled members of the British parliament on whether a ministry review had concluded that DU munitions are allowed under the Geneva Conventions. In an apology to MPs, Harvey admitted that the review had not been requested and did not exist. The status of DU munitions in the Geneva Conventions hinges on the question of environmental damage. As the Guardian‘s Rob Edwards notes in his story, in 1998 the UK government ratified a protocol of the Geneva Conventions that stipulates that all weapons must be reviewed on whether they cause “widespread and severe damage to the natural environment.”
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
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.