I remember when as a kid I learned about yeast.
You put yeast in an environment with some sugars, and it will eat the sugars and excrete alcohol until either sugar runs out or alcohol concentration is enough to kill it.
I remember thinking to my 11 or 12 year old self: "wow, yeast is dumb!"
Anyway, completely unrelated:
https://www.science.org/doi/epdf/10.1126/sciadv.adk1189