At first glance, cow digestion seems unremarkable: a bit of grass, chewing cud–done. But behind this seemingly simple process lies a highly complex system full of surprises. What happens inside a cow ...

An April 22 Facebook post (direct link, archive link) displays a video of a person reaching into a porthole-like device in a cow's side. "What A Sick World we live in," reads the text overlaid on top ...