Physicists have demonstrated all the ingredients of a nuclear clock — a device that keeps time by measuring tiny energy shifts inside an atomic nucleus. Such clocks could lead to vast improvements in ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Picture a clock ...

Scientists said we haven't made enough progress addressing existential threats. Scientists and global leaders revealed on Tuesday that the "Doomsday Clock" has been reset to the closest humanity has ...