Zarkon’s eyes theory
I actually know something about how cheese was first made (probably)! Animal stomachs were often used for liquid storage in ancient times, since they're water proof and worked fairly well. However, if not completely cleaned out, they have a lot of... stuff left inside them, some of which is rennet, an enzyme complex that we use to curdle milk to make cheese. Early humans probably stored milk inside a stomach pouch and left it a bit too long and voila!~ Cheese!