How did people discover yeast?

It turns into apple cider. Probably not very good cider, but cider nonetheless. The air around us is basically jam-fucking-packed with spores, yeasts, and bacteria. read more

Yeast was first recognized as a living organism in 1857. Prior to that, people would use sourdough to make bread. When brewing beer/wine, you can reuse the yeast left at the bottom of the barrel to start a new batch. read more

Humans have always used yeast, well before writing was invented. Egyptians used it to make bread some five thousand years ago. However, they ignored the yeast fermentation process and they believed this chemical reaction to be a miracle. read more