First up on the podcast, freelance science journalist Leslie Roberts joins host Sarah Crespi to talk about the long journey to a vaccine for group B streptococcus, a microbe that sickens 400,000 babies a year and kills at least 91,000. Next on the show, there are about 250,000 agricultural drones employed on farms in China. Countries such as South Korea, Turkey, and Thailand are swiftly increasing agricultural drone use, whereas the United States and Russia are proceeding more slowly. Food policy researcher Ben Belton discusses what appears to drive drone use in agriculture and how they might make farming more productive and sustainable. Finally, Science Books Editor Valerie Thompson brings books on the secrets rocks have to tell about humanity and the mystery surrounding a Druid preserved in a bog for thousands of years. This week’s episode was produced with help from Podigy. Authors: Sarah Crespi; Valerie Thompson; Leslie Roberts Learn more about your ad choices. Visit megaphone.fm/adchoices