BONUS: Got Vaccines?

On this shortie, Melissa got vaccinated and wanted to revisit the horseshoe crabs who made our vaccines --- and nearly every medical instrument and medication --- possible. Thanks, horseshoe crabs! ***** Big thanks to Freesound.org and Joshua Empyre for additional music for this week's episode. For all other information regarding this shortie, including the original resources of information, including the Sawbones episode (thanks Sydnee McElroy and Justin McElroy!) and RadioLab...