Genetics, Immune System Compatibility, and Attraction

As crazy as that sounds, it seems to be the case! How does that work? And also... how does the immune system work? And can someone please explain it using vampires and hot dogs as analogies? If those are for some reason questions you've ever had, then Dr. Rick Sullivan is your guy!   Are you an expert in something and want to be on the show? Apply here! Please please pretty please support the show on patreon! You get ad free episodes, early episodes, and other bonus content!