Stephen Hawking is new Master card, given as a promo card at Spiel 2018.
He has an instant effect: move an already placed book tile in the library to another book space without needing to satisfy the new book place request.
He gives 7 victory points at the end of the game.
Robert Hooke is new Master card, given as a promocard at GenCon 2018 and Spiel 2018.
He doesn't give any instant power but he gives 9 victory points at the end of the game.