Trump's order, protests in Greenland, floods in Italy

Donald Trump announced that the U.S. military had launched a "decisive and powerful" military operation against the Iranian-backed Yemeni Houthi rebels. Barbara Skrzypek, a long-time collaborator of Jarosław Kaczyński, has died. dense rains in northern Italy. Protests in Greenland against the policy of the United States. Waste at the deepest point of the Mediterranean. Here are 5 things to know on Sunday, March 16.