"A lot of traditions have ways of being carried from one land to another to another, but the handshake didn't make it to the West until the late sixteenth century." It wasn't too often that Fred had the chance to use the history degree she'd gotten before switching to mathematical physics, so it was nice to be able to share that bit of information.
Her large eyes watched the taller woman as she moved directly to the wall Fred had been writing on, which was a little embarrassing, but she slowly shut the door without commenting. Her arms automatically wrapped around herself as she stood in place for a moment, then smiled again at the question. Within seconds she was walking over and nodding. "Yes - though it's flawed because there are too many unknown variables, like who controls the seal, when it was opened, how it was opened, where people are when they were brought through, where they show up on this side, and similar things." The smile faded into an annoyed frown as she studied the equation herself. "I can't make it balance properly."