The Obama administration says it is eliminating a $100 limit on the value of Cuban rum and cigars that American travelers can bring back from the island. The administration is also lifting limits on cargo ship travel between the U.S. and Cuba and easing U.S. and Cuban researchers' ability to conduct joint medical research. The changes follow a series of steps taken since President Obama and Cuban President Raúl Castro announced on Dec. 17, 2014, that the Cold War foes would normalize relations after more than a half century of enmity.