As the U.S. military formally ends operations in Iraq, four top expert voices in the debate on the war differ over whether it merited the cost in blood, treasure, and U.S. credibility.

As China leaps into the new year with a new generation of leaders, four experts weigh in on what we can expect from the burgeoning power.

A Senate review of the CIA’s post-9/11 interrogation practices has rekindled the debate over U.S. counterterrorism. Karen Greenberg, Jack Devine, and Magnus Ranstorp weigh in on the findings.

How should technology firms balance the privacy demands of customers with the security concerns of government? Three experts weigh in.

With some findings of the UN’s Intergovernmental Panel on Climate Change in question, four experts debate how much the premier climate science review panel may need to make changes.