Our weekly news round-up: Scientists message ET and ask for a reply on June 21, 2043; NASA debates locations for Mars 2020 lander; European regulators flag privacy nightmare of kids' smart watches; Spectacular meteor flash over Finland; Facebook changes its 'delete post' option; Gamers unite against Star Wars Battlefront 2 micro-payments; Global software update enables ATM bitcoin transaction support; Google Assistant can troubleshoot your phone; Google busts itself for copyright breach.