SA Special Editions

After a years-long intellectual journey, three mathematicians have discovered that a problem of central importance in physics is impossible to solve—and that means other big questions may be undecidable, too

Long thought to be divorced from the brain, the immune system turns out to be intimately involved in its functioning

New fossils and analyses topple the long-standing explanation of how dinosaurs came to rule the earth

The first big digital currency gave us a glimpse of a new economic order—one that raises more questions than answers

Astronomers’ newfound ability to see the same cosmic events in light, particles and gravitational waves—a synthesis called multimessenger astronomy— gives them a fuller picture of some of the universe’s most mysterious phenomena

Artificial intelligence is making it possible for anyone to manipulate audio and video. The biggest threat is that we stop trusting anything at all

Microscopic wear patterns on fossil teeth reveal what our ancestors ate—and provide insights into how climate change shaped human evolution

Resurgent outbreaks of infectious diseases are sickening thousands, and the causes are societal

Coastal communities struggling to adapt to rising seas are beginning to do what was once unthinkable: retreat

The Arctic climate is shattering record after record, altering weather worldwide

Science mourns the death of physicist and icon of science Stephen Hawking

And what we can do about it

Physicists who have revived experiments from 50 years ago say nerve cells communicate with mechanical pulses, not electric ones

Scientists scramble to analyze data from the eruption of Kilauea, hoping to predict similar events elsewhere

How digital drug dealers and virtual users are providing clues to help stop the U.S. opioid epidemic