Answer: through intermarriage and education.
Explanation:
The items which are most durable as a form of currency (and are also the most portable) would most likely be olive oil. Olive oil has a long shelf time and doesn't require nor take up much space. It is very precious in lower quantities and is therefore a good currency.
In the early 1800s, stores weren't authorized to issue currency themselves.
Answer:
Ideas such as eugenics and cloning.
Explanation:
This are controversial because would be tried in humans and would open up not only many moral and ethical debates but also in it's aplications, which cases, at which people, how, etc.
They rode by horse back and knocked on doors. They probably used sign laugnge or Morse code