Since April 2018, the black-market dollar-exchange rate for the Iranian rial has risen sharply, reflecting the poor state of the country's economy and sparking protests.
Venezuela, Saudi Arabia, and Canada own the largest proved oil reserves in the world.
40.3 million people worldwide work under forced-labor conditions, live in a forced marriage, or experience another form of modern slavery.
Though 94 percent of the world's stocks have been destroyed, chemical weapons have made a macabre comeback in the Syrian war.
Less than 4% of the world's declared chemical agent stockpile has not yet been destroyed.