Scientists Can Now Hear The Background Hum Of The Universe For the first time ever, scientists have heard the “low pitch hum” of gravitational waves rippling through the cosmos. It’s this ever-present background noise set off by the movement of massive objects—like colliding black holes—throughout the universe. Scientists have theorized that it’s been there all along, but we haven’t been able to hear until now. So what does this hum tell us about our universe? SciFri producer Kathleen Davis talks with science writer Maggie Koerth about this discovery, as well as other science news of the week. They chat about the possibility of an icy planet hiding in the Milky Way, air quality problems due to wildfire smoke, an experimental weight loss drug that’s currently being tested, if our human ancestors were cannibals, and how dolphin moms use baby talk with their calves.   Celebrating The Weird, Wonderful World Of Cephalopods Every year, Cephalopod Week reminds us of the fascinating and weird world of these sea creatures. And in this segment, recorded live at the University of Miami’s Rosenstiel School of Marine, Atmospheric, and Earth Science Auditorium, two cephalopod scientists share new research about our squishy sea-faring neighbors, how climate change is affecting squids and octopuses, and why they love working with them. Ira Flatow talked to Dr. Lynne Fieber PhD., professor of marine biology and ecology who has studied the nervous systems of all types marine invertebrates including cephalopod and sea slugs, and Dr. Andrea Durant Ph.D., a postdoctoral fellow in the Grosell Environmental Physiology and Toxicology Lab, who studies how tiny glass squid live in a rapidly-changing ocean.   To stay updated on all-things-science, sign up for Science Friday's newsletters. Transcripts for each segment will be available the week after the show airs on sciencefriday.com. Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.