Feature
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EcosystemsLight All Night
New digital images demonstrate that artificial light from urban areas penetrates deep into some of America's most remote wild places, where it may disrupt ecosystems that have evolved with a nightly quota of darkness.
By Ben Harder -
Prescription for Controversy
Increasing concerns about the efficacy and safety of a popular class of antidepressant drugs, selective serotonin reuptake inhibitors, especially in depressed youth, has sparked regulatory action and scientific debate.
By Bruce Bower -
AstronomyPeeling Back Orion’s Layers
By studying the most detailed portrait ever assembled of the Orion nebula, astronomers hope to glean new insights about star birth throughout the galaxy.
By Ron Cowen -
MathAll Square
Mathematicians nail down when it's possible to express numbers as the sums of squares.