Hints and tips:
...But while Washington has speculated such injuries may have been caused by an unknown weapon, Ottawa has remained silent, forcing its injured diplomats to speak out....
...The name of the next Spanish prime minister will remain unknown for at least several more weeks....
...For example, sharing a signature that identified a virus for a previously unknown threat would help the recipient prevent, detect or contain an attack....
...It was a rather grandiose title to bestow on an event open only to American teams and concerning a sport unknown to most of humanity.Yet baseball was an American invention, and although it was not played...
International Edition