6,800 feet below ground, in the search for dark matter, something has gone very, very cold

Six thousand eight hundred feet below the floor of an active nickel mine in northern Ontario, something has gone extremely cold. Not cold in the way of a walk-in freezer, or a liquid nitrogen tank, or ...
Nature

Elusive ‘nuclear clocks’ tick closer to reality — after decades in the making

Physicists are getting closer to creating a long-sought ‘nuclear clock’. This device would keep time by measuring energy transitions in the nuclei of atoms and could become the most precise clock on ...