But it does use atomic warning signs to tell time
They look like vintage furniture...until they start to glow.
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.
Famed for his theoretical experiment in which a cooped-up cat neither lives nor dies, the physicist would have been 126 years old today.
Clean electrical power from a fusion reactor remains a distant goal, but it's one step closer following a test in which fusion energy output exceeded the energy pumped into a fuel pellet.
Is another nuclear emergency in the offing? Japanese officials express concern about the plant operator's ability to control the situation after a new leak is discovered.
Online music services mine data to figure out the music you like. So who did they predict as Grammy winners? And which service came out on top?