Extremism
A radicalization expert explains what countries can do to stem the violence.
The terrorists' efforts to go viral are stymied, a new study finds.
The Southern Poverty Law Center says Donald Trump "electrified the radical right."
Critics say Cameron's decision to single out Muslim women in his op-ed and to cite extremism as justification for English classes could further ostracize Muslims in the U.K.
WHAT'S HAPPENING
"We’re hoping to not just share words, but to take action."
Israeli security authorities estimate that hundreds of Jews belong to extremist groups.
They had been held captive since February.