![Scientific American Magazine Vol 327 Issue 4](https://static.scientificamerican.com/sciam/cache/file/2A5A9828-26E7-4F2A-B4D782A9445CCF0B_source.jpg?w=300)
Volume 327, Issue 4
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Features
See the Facility That Tests whether Nuclear Weapons Work
Gargantuan lasers induce a fusion reaction to test the U.S. nuclear stockpile
Viking Textiles Show Women Had Tremendous Power
Cloth from Viking and medieval archaeological sites shows that women literally made the money in the North Atlantic
How Gaslighting Manipulates Reality
Gaslighting isn’t just between people in a relationship—it involves social power, too
The Sky Needs Its 'Silent Spring' Moment
A surge of new research underscores the growing global problem of light pollution—as well as the urgent need for public awareness and action
How Squishy Math Is Revealing Doughnuts in the Brain
Topology, sometimes called rubber sheet geometry, is finding patterns in the brain, drugs and evolution
Artificial General Intelligence Is Not as Imminent as You Might Think
A close look reveals that the newest systems, including DeepMind’s much-hyped Gato, are still stymied by the same old problems