Fascinating!

"Got a feeling you’re not alone? Forget #alien life forms—we’re talking an altogether different kind of critter: the trillions of #microbes that call your #body home. The majority of these tiny creatures live in your #gastrointestinal tract. But how did they get there? What do they do? What happens when they get out of whack? And what can we do about it?"

#Gut #bacteria : the inside story
https://www.science.org.au/curious/people-medicine/gut-bacteria