There is increasing evidence on how our gut microbiome plays an integral role in our overall health, but how do microbes even survive the stomach when the acids and enzymes attack everything that reaches it? Jon answers questions from the comment section. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Check out the original talk that sparked the question and this video: https://youtu.be/xlEFI5A3QFM The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter