It wasn’t too long ago that scientists didn’t even know that many sicknesses were caused by germs. We didn’t have the technology to see them nor the data to show that bacteria and viruses were causing the sickness. And by not too long ago, I mean about a couple hundred years ago.

Today, we’re going to learn that fascinating story behind how scientists discovered that bacteria were actually causing a lot of the sickness in the world and what they proposed we do about it.