Podcast: Wolves versus dogs, medium-sized black holes, and more By Meghna Sachdev, Sarah CrespiAug. 22, 2014 , 2:00 AM Are dogs more dominant than wolves? Where are all of the medium-sized black holes? And why are so many elephants dying in Africa? Science's Meghna Sachdev chats about these stories and more with Science's Sarah Crespi.