"There're these - beings, I don't know if they think - called Dementors. They feed off positive emotions; in their presence it is impossible to feel happy, and with extended time in thier presence impossible to do anything but relive the worst moments of your life, over and over. People convicted or in some cases just accused of crimes go to Azkaban. They usually stop eating and die."

"So, yeah."

"You have a plan for that one too?"

"No, I figured all it really needs is a new paint job.

- containing wizards is a little bit complicated but even without anything from 2179 we have plans in the works."

"What are they?"

"I don't have my notebooks - can you just make them, they're next to my bed and they're green and they literally say 'plans for world domination' on the cover -"

"Are your notebooks inherently magical in some way?"

"...well, I don't want random people to be able to read the world domination plans..."

"I can't make magic stuff."

"Oh. Sorry." Door - "Accio notebooks -"

"They'll probably be a minute, someone'll have to let them out of the common room."

"They have to travel through not only the intervening space but a clear trajectory through it? How do they pathfind?"

"Magic. I think my father checked once, they pretty much try to go directly at you and nose around if they run into obstacles, they can in fact get stuck even if there's a path to you if there're specific traversibility properties -"

"Aww, nosing books."

"Common room's always full of people, someone'll let them out for me."

Cam awaits the approach of books.

Books! He flips them open to the section on criminal justice reform! "I guess I should summarize current procedures so all of this makes sense - most law enforcement in Britain is done by the Ministry of Magic, which has a bunch of somewhat autonomous departments which enforce laws under their own purview. Things that'd warrant a sentence in Azkaban are usually heard by the Wizengamot, a gathering of around eighty preeminent and elderly wizards from families of political importance - seats are inherited -"

"Of course they are."

"I am deriving a lot of satisfaction from how the future apparently considers all the things I personally dislike to be abhorrently primitive."

"Bar give you a future history lesson?"

"Hasn't been time for a very thorough one but I picked out books for people who'll be good at implementing them and I flipped through them to see if they covered the bits we'll need."

"What other personally disliked primitivenesses turned up?"

"Slavery gets abolished, non-property-owners get to vote, wizards're actually better than Muggles on women being allowed to own property and so on but the Muggles get there too, adversarial justice systems instead of 'the accused can speak in their defense if they want', my little brother Aaron has strong feelings about financial systems and is going to be outright gleeful at the idea of fiat currency..."

"Wait, has fiat currency not been invented yet in 1802 -?"

He gestures at the fat gold coins he had out to pay Bar for the goodies. "Muggles some places have it, backed by gold or silver in their reserves..."