Of all the bacterial communities in and on humans, we know the most about the digestive system bacteria. These microbes are extremely important for proper digestion of plant fibers, synthesizing vitamins, short-chain fatty acids, protecting our gut lining, breaking down medicines, and many other properties we are still learning about. One of my favorite science podcasts, Brains’s On!, does a fun job talking about our gut bacterial friends from a different perspective – farts! Depending on your microbial community and what you feed it, sometimes as your microbes are doing their work breaking down the foods we eat they give off gaseous compounds.