Podcast: Coexisting With Lions, Monkeys Doing Math, and the Importance of the Y Chromosome By Nadia Whitehead, Sarah CrespiApr. 24, 2014 , 12:00 PM Coexisting With Lions, Monkeys Doing Math, and the Importance of the Y Chromosome Are lions killing off cheetahs and wild dogs in Serengeti National Park? Are monkeys mathematicians? And is the Y chromosome more important than we think? Science’s Nadia Whitehead discusses these latest stories with Science’s Sarah Crespi.