A sign at the old Kerr-McGee uranium mill site in Grants, N.M., warns of radioactive material. This week, the Justice Department announced a $5 billion settlement against the mining company to pay for the cleanup of toxic sites the company left across the U.S. over a period of more than eight decades.
Susan Montoya Bryan/AP
Paul Rusesabagina, who sheltered more than 1,000 people in his hotel during the Rwandan genocide, says the brutal violence in Syria, the Central African Republic and the Congo shows history repeats itself while people fail to learn from it.
Courtesy Hotel Rwanda Rusesabagina Foundation
Iranian students climb over the wall of the U.S. Embassy in Tehran during the Iranian Revolution, Nov. 4, 1979. The students went on to seize the embassy staff, and hold 52 of them as hostages for 444 days.