Waiting for Orion to come around, Megatron let the librarian take the lead - and not just to indulge a shade and get a better view from behind. While he was pretty sure he knew where Orion was going, if he led that would sort of defeat the point of asking.

"I'm going to be difficult," Megatron said, pausing briefly to smile as he came up slightly beside the librarian. "From as early as you have to recent. That is, obviously, a lot of data, so perhaps starting with a limited span of time would be more expedient." He did of course not really believe the library - any library, would have a complete and thorough (unedited) overview of what he was asking, but he had to start somewhere.

"Looking for any era in particular without a wider context wouldn't be of much use, after all."