From the April 1981 issue of Popular Science: "When scientists finally detect a form of energy they have never seen, they will open a new era in astronomy."
New observations suggest your jewelry may have originated from colliding stars. Twinkle, twinkle!
Toxin sniffers, missile jammers, dirty-bomb detectors: Will a new security arsenal make us safer?
Thunderstorms may emit invisible dark lightning alongside ordinary lightning.
Rossi--a lone Italian inventor with no real credentials and a history as a convicted scam artist--has convinced a small army of researchers that his box can harness a new type of nuclear reaction. What if they're right?
Scientists think a nearby collision of neutron stars could explain the undocumented onslaught of high-energy radiation in the eighth century
A black hole with a mass of 55 million suns
Cosmic explosion was not a typical gamma-ray burst
The first handheld radiation detector
9/11 fanned fears of more terror attacks by air. But our 95,000 miles of coast may be much more permeable. Here's the new defense strategy.
A former spy's excruciating death by radiation poisoning marks the beginning of an era of high-tech hit men who can kill from anywhere
It's the ultimate nightmare: a nuclear attack in the U.S. masterminded by terrorists. Here's how that could happen-- and how we can prevent it
Dark matter makes up much of the cosmos, yet no one knows exactly what it is. Soon, physicists may finally solve one of science's biggest mysteries.
Launch the gallery below, and enjoy our favorite pictures of the year, all in one place
How 'Higgsy' is this particle? More work needs to be done
It's not too late to upstage those smug Doctor Who fans.