I'm Dr. Universe, and if you're anything like me, you've got big questions about our world. I get lots of questions from kids wondering about aliens.In this episode, we meet Afshin Khan, an astrobiologist who studied signs of life when she was a Ph.D. student at Washington State University. She shares her adventures to uncover the teeny, tiny life that forms framboidal pyrite on Earth -- and what it would mean if we found those structures outside Earth.As always, submit your burni...more