PBS News Hour S41 E30 February 11, 2016

Thursday on the NewsHour, Hillary Clinton and Sen. Bernie Sanders ready for PBS’s Democratic debate in Milwaukee. Also: How Egypt’s courts enforce the government crackdown, spacetime ripples prove the theory of relativity, puppies conceived by IVF may help save endangered animals, how economics can help you find love, a look inside the world’s largest refugee camp and comedian Billy Eichner.