A clock built from thorium-229 has crossed an important line, from a long-discussed concept to a working device. The shift matters because this clock does more than keep time. It can also watch for ...

Scientists have built the first working nuclear clock, which uses the vibrations of atomic nuclei to keep time. Nuclear clocks have been sought after for more than two decades and could eventually ...

Add Yahoo as a preferred source to see more of our stories on Google. A working thorium-229 nuclear clock now tests fundamental constants and sets new limits on ultralight dark matter. (CREDIT: Shimon ...