Matthew Bunn, a professor specializing in nuclear arms control at Harvard's Kennedy School, tells NPR's Ayesha Rascoe about concerns over a new nuclear arms race as the U.S. looks increasingly inward.
NPR's Ayesha Rascoe asks Dr. Rebecca Smith-Bindman about her research indicating CT scans, which emit radiation, will cause some 100,000 cases of cancer annually.
"Brothers and sisters, Happy Easter!" Francis said, his voice sounding stronger than it has since his hospitalization. "Viva il Papa!" (Long live the pope), the crowd responded.