Why is everyone so interested in feces? The story of the gut featuring a whole bunch of actors

This is a short documentary about the gut microbiota. It describes how humans have treated and studied fecal matter since the early days. There is also a short animation that depicts how the large intestine is like in normal and aberrant conditions. Lastly, there are also some discussion about their future prospects.

Some of the reference materials：
https://www.nature.com/articles/s41579-020-0433-9
https://daily.jstor.org/the-early-history-of-human-excreta/
https://www.cell.com/trends/microbiology/fulltext/S0966-842X(22)00007-5