"Anything that's significantly emotional," Ianto said with a shrug. "I don't really know the details myself, no one was really paying much attention to me at that time. But when Owen used the one half he witnessed a crime from the past, and when Gwen used the other half she saw a murder that happened in the future."

"Sorry I can't be more helpful about it, really," he said. He bit his lip a little. "I think it's better left alone and out of this century, though. Both of them were pretty shaken up about it all. It doesn't seem to be something to be playing around with, even if it is in the name of science."