This week on the io9 show, we explore the microbiome with a homemade laser microscope in Esther Gets Experimental. Plus, scientists with the Human Microbiome Project have identified more than 5 million different microbial genes from 18 areas of the human body — what does this mean for science fiction? We also ponder the news that Saturn's moon Titan may have a vast, underground ocean made of liquid water.

You can catch more episodes of the io9 Show on YouTube or Revision3. We're also on iTunes! Tune in every Friday for more startling revelations from the world to come!