Add Yahoo as a preferred source to see more of our stories on Google. Mourning and outrage have shaken the nation as mass shootings continue to mark some of the latest chapters of a long history of ...

Wednesday’s massacre in San Bernardino was the latest mass shooting in America. By some counts — including a heavily cited version — it was the 354th of the year. By a narrower definition, it was the ...

There is no universal standard for what constitutes a mass shooting, potentially causing discrepancies in data and research among authorities and experts -- and confusion for the average person. "Some ...

Using a new technique, astronomers have documented one of the heaviest neutron stars known to science. It’s an important discovery for astronomers, but the newly recorded object is also providing an ...

There is no consensus among organizations that track shootings in the U.S. about the definition of "mass shooting" Twenty-one shot dead in Uvalde, Texas. Ten in Buffalo, N.Y. Four in Tulsa, Okla.