Not sure why this got down voted. Maybe slightly off-topic (but still this is a rather invasive method of study), but it is true. https://www.npr.org/sections/

Not sure why this got down voted. Maybe slightly off-topic (but still this is a rather invasive method of study), but it is true. https://www.npr.org/sections/thesalt/2015/08/12/430075644/dining-like-darwin-when-scientists-swallow-their-subjects https://www.npr.org/sections/thesalt/2015/08/12/430075644/di...