San Francisco Chronicle: San Francisco’s city council—its Board of Supervisors—voted on Tuesday to approve a new regulation that governs the sale of cell phones. If city mayor Gavin Newsom signs the law, shops that sell cell phones will have to disclose how many watts per kilogram of body tissue each type of phone emits. The Federal Communications Commission limits that emission measure, known as the specific absorption rate (SAR), to 1.6 W/kg, but does not require device manufacturers to disclose SAR values to customers.
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.