Luckily for us, nobody here has to worry about that. We're writing our canon as we go along, and we know what we're writing about isn't the universe we live in now (thank goodness!), so it's no sweat for us.
Honestly, we wouldn't want to live in the universe most of us came from. We don't understand how the body can stand to keep the details in his brain. Just remembering what it was like is bad enough, thank you very much.