 The time is 18 minutes past nine, still ahead on Weekend Edition. NPR's Ayesha Roscoe speaks with Stefano Schiavone, a professor at the University of California, Berkeley, on the benefits of using fans in conjunction with air conditioners. And NPR speaks with director Levin Akin about his new movie, Crossing. It tells the story of a woman searching for her long-lost niece in Istanbul. Stay with us.