So here is an answer to the Fermi paradox: we’ve been looking for a broadcast when we should have been looking for a message in a bottle. (We might argue, however, that if ETCs would find it so easy to send a physical message then why haven’t we already seen one? Since it would be pointless to hurl a small bottle into space by itself, they would surely attaching a clear, noticeable, persistent beacon to the bottle. Where are the beacons?)
