7. People going into the Upside Down
It was earlier said that the air in Upside Down is very toxic that’s why people wore protective gear before entering that place. But in many episode it is seen that Nancy, Joyce, Hopper and some others go into the Upside Down without any protection and still come out safe. Even Will survived there, How can it happen? How did they survive?
8. How did Will survive in Upside Down?
Without food and water Will came out alive from Upside Down. How did he manage to survive? How did he breathe the toxic air and not die? Many questions are still pending.
9. Eleven’s origin
Eleven’s origin has been a mystery and how did she gain all the powers from experiment is also very unclear. What actually happened with her and her mother is not known till now.
10. Electricity in Upside Down
How is electricity generated in Upside Down? It is basically a parallel universe and in decaying form, who could produce electricity there is still messed up.