U.S. missile defense in the twenty-first century is focused on emerging threats from North Korea and Iran, but critics say these systems are too costly and largely unproven.

The scramble for energy alternatives has brought new focus on nuclear power in the United States, but its revival faces political and practical obstacles.

New York remains a global heavyweight in financial services, but markets in London and East Asia are gaining strength and posing a serious challenge to the Big Apple.

Interest in nuclear power is increasing, but securing adequate uranium supplies for nuclear fuel faces challenges ranging from a flagging mining sector to fears of nuclear weapons proliferation.

Backgrounder: Economists say Iran’s mismanaged energy sector and falling oil prices could have consequences for its economy.