In This Episode: SpaceX’s Falcon Heavy is scheduled for its first flight tomorrow, and attempt to soft-land all three rocket cores: will it land in three pieces, or millions? Amazon has set up some interesting tech to keep Alexa from responding when they don’t want it to (and users have figured out other interesting hacks). Youtube to label propaganda items as “state-sponsored” — and that includes PBS?! How ads work on Youtube — and most web sites. Microsoft removes a useful backup capability from Windows. And an update on cell phone safety.