The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
Answer:
you want me to give you the link to the slide
Explanation:
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People could start using robots to do work around their house and provide companionship starting in 2030. We could live in a Matrix-like virtual world by 2045. People could also become Cyborgs by 2045. People could control their home settings using artificial intelligence by 2040 as well.
Answer:
It allowed then to build perfect settlements
