Episode 1112:00
38 Trillion Roommates
Meet the neighbours Downtown
- Full house.About 38 trillion bacteria live in an adult.
- Head count.That’s roughly one bacterium for every human cell.
- Downtown.Most of them live in the colon, and the lights are always on.
Far-out fact
About 38 trillion bacteria live in an adult, roughly one for every human cell, and most of them live in the colon.

