A profile of the chemical agent mustard gas.

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.

Demands by Iraqi Kurds for greater autonomy have roiled their Turkish neighbors.

The government of North Korean President Kim Jung-Il retains a virtual death grip on the nation’s economy, directing all official economic activity through an authoritarian command system. But recent…