Taking Zoe's hands, Sydney gently led her over to the couch and sat with her, tucking one leg underneath as she wrapped an arm around Zoe's shoulders. Maybe this was her last chance, to finally open her sister's mind and show her the truth about the world itself....as long as Zoe didn't hate her for it.
"Well...the best way to explain it would be scientifically, actually. You've taken physics with dad, right? And he touched on quantum mechanics?" Not that he really gave credence to it, but Sydney knew that he'd included it in her education, and likely Zoe's. After her sister nodded, she continued. "The Tesseract, essentially, bends the...the fabric of the universe, and creates a wormhole between dimensions. It pulls people through this wormhole and deposits them in this world, this dimension. Because time and space aren't exactly linear, it can pull us from any point." It was a very rough description, but it was the best Sydney could come up with - especially without her charts and graphs.