News
- Earth
Rapid evolution may be reshaping forest birds’ wings
Logging during the last century might have driven birds in mature boreal forests toward pointier wings while reforestation in New England led to rounder wings.
- Earth
Hazy changes on high
A big boost in coal burning, especially in China, is adding aerosols to the stratosphere.
- Tech
Isotope crisis threatens medical care
Global production of the feedstock for the leading medical-imaging isotope is low and erratic, putting health care in jeopardy.
- Physics
Casper the Quantum Ghost
Researchers find that a strange kind of imaging relies on quantum mechanics.
