Function read 

pub fn read() -> Power

Every fact, as the reading thread read it (watch, started and asked): its last reading while younger than KEPT_FOR, else the next one, waited for WAIT at most (the first of this process, or the thread asked again after a rest: ASKED_FOR); none by then, nothing said. Never opens a bus nor asks it anything itself; for work that may wait on a thread of its own (the spam filter’s training), never for an exchange (kept_power).