A clock built from thorium-229 has crossed an important line, from a long-discussed concept to a working device. The shift ...

Add Yahoo as a preferred source to see more of our stories on Google. Atomic bombs work via a process called nuclear fission that involves atom splitting. Shortly after scientists discovered nuclear ...

A clock based on radioactive thorium atoms realises a long-held ambition, demonstrating a technology that could eventually beat the accuracy of today’s best atomic clocks ...

Iran’s ban on international nuclear inspections has led to a critical loss of knowledge about the country’s atomic work, United Nations monitors wrote in two restricted reports, their first since the ...