> People thought the black plague was wrought and spread by evil spirits. They could have easily managed to prove it was being spread by rats, if they were so i

> People thought the black plague was wrought and spread by evil spirits. They could have easily managed to prove it was being spread by rats, if they were so inclined, but who'd have thought to consider such things at the time? Well, about that - https://www.livescience.com/61444-black-death-cause-found-transmission.html https://www.livescience.com/61444-black-death-cause-found-tr... https://www.pnas.org/content/115/6/1304 https://www.pnas.org/content/115/6/1304