Podcast: Kitty contraceptives, the fate of Chernobyl’s wildlife, and how spiders got their knees

Have we finally found the holy grail of animal birth control? How did spiders get their knees? And could it be true that humans are worse for wildlife than nuclear fallout? Science’s Associate Online News Editor Catherine Matacic talks about these stories and more with Science’s Sarah Crespi. Plus, Talia Berkowitz tells us about a math app that can boost achievement at school.