Germ theory: that would include the value of washing food, and washing hands before preparing food, covering sneezes, getting the latrines out of the water supply, washing hands and sanitizing instruments before surgery or assisting at childbirth, burying the dead outside the water supply, etc.
Food preservation was another problem. Canning would be a good addition.
Silly, I know but the screw can late. The expression dead as and door nail comes from killing "deading" nails, that is nailing them flat across the wood where they pop out on the other side of the boards. Without deading door nails would work their way loose.
The knowledge that lead is poisonous.
Food preservation was another problem. Canning would be a good addition.
Silly, I know but the screw can late. The expression dead as and door nail comes from killing "deading" nails, that is nailing them flat across the wood where they pop out on the other side of the boards. Without deading door nails would work their way loose.
The knowledge that lead is poisonous.
If there is a god, I want to believe that there is a god. If there is not a god, I want to believe that there is no god.
