Way back in 1897, some doctors at the Bellevue Hospital Medical College in New York City decided that it might be a good idea to bury a time capsule. This wasn't just any time capsule with the typical yet-to-be-nostalgic odds and ends. No, this time capsule was sick; it was full of bacterial spores called Clostridium perfringens.
These little guys still live in your average human intestine, but they don't do the same kind of damage they used to. Back in the day, they used to be responsible for infections that would often lead to gangrene. The spores are able to hibernate and that is why Dr. Martin Blaser, a bacteriologist at New York University, decided to crack it open and try to nurse the bacteria back to health. For science!