Then there's a break in the case from the Farnsworthbot, who finds a connection. Whatever Logan International or the Transportation Security Administration are in the other universe, they have different names, as Farnsworthbot doesn't know what they are. But she does figure out, based on their voucher stamps, that all three were screened by the same security agent. Astrid confirms it, feeling a little bit strange about being shown up by her own self, but Farnsworthbot is just enjoying her coffee like it ain't no thang.

So it's off to Logan International to arrest TSA badge 0047, also known as Neil Chung. He sees them coming, though, and quietly walks away from his post while Olivia and Peter struggle to get through the crowd. They're stopping from getting into the boarding area anyway by another agent, who tells them they either have to have a boarding pass or supervised authorization. Seems kinda foolish that they didn't think to call ahead to maybe avoid this kind of problem. At any rate, Chung gets away.

After the commercial break, Peter and Olivia are now talking to a professor at MIT, because that's where Chung was previously employed. Peter asks the professor how an advanced mathematics professor winds up working for the TSA. "I suppose he loses his mind," says the professor, explaining that while everyone around there is driven, Chung put them all to shame: youngest tenure track professor ever, believed math was the key to unlocking the secrets of the universe. "I know how that sounds," says the professor, apologetically. "Not nearly as crazy as you might think," says Peter.

Anyway, Neil came back from his summer break at his lake house -- and given the scene from Reiden Lake in the "previously on Fringe" clips this week, you know where this is going -- and he was "changed." Neil found something, wouldn't say what it was, and became obsessed with high-level differential equations that no one could make heads or tails of. I wish that were the kind of problems we'd have at my work! Neil's theory was that if he could solve the equations, space and time could be flattened and be on a level plane: "You could in essence see past, present and future simultaneously," he says. That twigs for Peter, as the professor continues, explaining that solving the equations became more important than class, and eventually he just left and never came back.