It’s a nightmare faced by families all around Los Angeles: After wildfire smoke blanketed homes, schools and offices with toxic chemicals, when is it OK to go back?
The attack, at a remote uranium mining site in northern Saskatchewan, was only the fourth fatal black bear encounter in the province’s recorded history, officials said.
As the leader of the C.D.C.’s influenza division, she battled to keep up with an ever-changing viral opponent, building a global network of researchers and forecasters.