For the first time, we have telescopes strong enough to see the radioactivity at the heart of the supernova known as Cas A. What scientists have seen there helps unravel the mystery of how a star dies.
Marie Curie, the scientist who coined the word radioactivity and won not one but two Nobel prizes, was born on this day 144 years ago.
Google's home page features a celebration of Edmond Halley, of Halley's Comet fame.
Superman will tremble when confronted with a batch of DIY fluorescent candy made to look like Kryptonite.
Tiny amounts of radiation from the stricken nuclear power plant have spread across the Pacific. An expert from Columbia's Center for Radiological Research assesses the health risks.
For more than 40 years, the U.S. government tested nuclear weapons deep in the Nevada desert. Now the site is a reminder of what a scary world that was. CNET Road Trip 2012 investigates.
A nuclear expert with Physicians for Social Responsibility says there is no "safe" level of radiation. But for now, he advises caution, not panic.
Anxiety over Japan's damaged nuclear plant increases as top U.S. nuclear regulator calls situation worse than reported by Japanese government and says "extremely high" radiation levels could hamper containment efforts.
The inventor of the light bulb and phonograph was named the greatest innovator of all time among 52 percent of the young people polled, surpassing the late Apple leader at 24 percent.