A Gut Feeling Warning: Attempt to read property "ID" on null in /home/frost/public_html/wp-content/themes/frost-science/content-single.php on line 21 March 27, 2019 /home/frost/public_html/wp-content/themes/frost-science/content-single.php on line 30 https://www.frostscience.org/fun_fact/a-gut-feeling/">By , Your digestive tract is home to around 100 trillion bacteria—more than all the stars in the Milky Way galaxy.