I guess either telepathy or repeatedly smashing their heads with a book. First method needs a lot of work so they for now settled for the second one (btw collected works of Marx, Engels, Lenin are together at least 95 books, usually hardcover, good luck).
I guess either telepathy or repeatedly smashing their heads with a book. First method needs a lot of work so they for now settled for the second one (btw collected works of Marx, Engels, Lenin are together at least 95 books, usually hardcover, good luck).