I don't know what surprises me more, that Brody sat still to watch a science program, or that he remembers part of it.
I chose "polarity torsion" because it sounds scientific and a Google search on it turns up nothing. The real gravity detectors I've read about recently involve things like a laser beam or a torsion bar.
My guess is that the program was being shown on the TV in his holding cell.
In other news, I haven't recommended you any indie games in a while. So, I think it is very, very important that you play Enviro-Bear 2000: Operation: Hibernation. You'll thank me!