Did Douglas Adams use email as a child?
Rationale first then the answer.
Douglas Adams was born in 1952. Modern email did not emerge until 1977.. The answer is: no.

Would 2019 Natalie Portman avoid a Snickers bar due to her diet?
Rationale first then the answer.
Actress Natalie Portman resumed her vegan diet in 2018 after giving birth, and has been vegan ever since. Vegans do not eat animal products. Snickers contains egg whites as an ingredient.. The answer is: yes.

Can a jet plane be made without society?
Rationale first then the answer.
A jet plane requires many materials to build. A jet plane requires much prior knowledge to build. The specialized knowledge and materials is not obtainable without other people.. The answer is: no.