One can only guess. [ She's practically giddy as she begins writing on her notepad. ]

So, as an employee, you have no recollection of any history between Aperture and this dimension before your own personal involvement? That proves either this endeavor was a failed attempt by Mr. Johnson and myself and we left it alone until your new involvement. Or! We may be experiencing a moment where two individuals from different times are interacting-perhaps even creating two new time lines and therefore two new universes simultaneously with new histories!

[ She looks up for a moment and just takes a deep breath and smiles before going back to writing furiously. ]

This is truly, truly amazing. I need to make a note to be careful of any possible other mes. We wouldn't want a horrible time paradox.