How scientists are decoding what the past smelled like
https://edition.cnn.com/2023/03/27/world/decoding-how-the-past-smells-scn/index.html
If contemporary people go back to the era which is more than 200 years ago, it must be suffering for them to smell everything. That's because people did not take shower and sewage system was not enough or there was no sewage system.
The problem is not only smelling bad, but also is being infected with viruses easily.
There used to be many kinds of viruses contemporary people do not used to.
