Bacteria
SciShow Tangents - Un pódcast de Complexly - Martes
It's easy to write off bacteria as no good, nasty, disease causing creeps, but consider this: without bacteria, we wouldn't have yogurt, or delicious sourdough bread, or a gut microbiome to digest those things! There are probably other good examples of ways bacteria are helpful to us, but I'm too hungry to think of them...