Well, the thing about any fiction is that we all have to play Tim Gunn and make it work. Like, Em and I can mess about a bit with the science on the locaters and things, but we have to make sure that within our world, the science is science. That it works the same way every time and that we don't go making things up just because it's convenient for a situation. We've already changed the science on the watches and necklaces like twice, and each time we have to go through and rework a scene or something.