Ukrainian President Volodymyr Zelensky said on Saturday that Kyiv's counteroffensive is "moving forward," after making some small gains in its campaign to recapture territory seized by Russia.
Russia's newest nuclear weapons system is now operational, a top Moscow official said. It comes as Ukraine is making some progress in the southeast of the country.
John Goodenough created a battery that has provided energy to smartphones, laptop and tablet computers, lifesaving medical devices and clean, quiet plug-in vehicles.