Podcast: Radioactive Bacteria, the Secrets of Baby Rocking, and More By David Grimm, Kerry KleinApr. 25, 2013 , 3:30 PM How might radioactive bacteria battle cancer? Why do babies like to be rocked? And what are the dangers of taking two antibiotics at once? Science's Online News Editor David Grimm chats about these stories and more with Science's Kerry Klein. Read the transcript. Hear more podcasts.