Whales and dolphins have incredibly sensitive hearing and are known to be harmed by loud underwater noises. David Grimm talks with Sarah Crespi about new research on captive cetaceans suggesting that some species can naturally muffle such sounds—perhaps opening a way to protect these marine mammals in the wild.

Sarah also interviews Staff Writer Jeffrey Mervis about his story on the future of autonomous cars. Will they really reduce traffic and make our lives easier? What does the science say?   

Listen to previous podcasts.   

[Image: Laura Wolf/Flickr; Music: Jeffrey Cook]